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JP2004340673A |
To provide a signal processing circuit and a dynamic quantity sensor capable of obtaining an output which does not contain noises caused by the offset voltage of an operational amplifier.Electric charges (3C, Voff) which are based on the...
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JP2004336197A |
To provide an analog-digital converter having a high production yield with high accuracy.The converter comprises a plurality of stages of devices, each composed of an analog-digital converter for converting an analog input signal to a di...
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JP3589713B2 |
PURPOSE: To obtain the switched capacitor filter in which a charge/discharge speed deterioration due to the effect of a parasitic capacitance between a 1st polysilicon electrode and a semiconductor layer forming a well is not caused when...
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JP2004289802A |
To provide a low-pass filter having a structure comprising a switched capacitor circuit with a very low cut-off frequency which is immune to the influence of a leakage current from an analog switch, and a semiconductor pressure sensor de...
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JP2004254422A |
To obtain an output voltage having little distortion using small circuit scale.A transducing unit 100 includes a plurality of converters 30-3R each having (N×M) pieces of capacitors Ck, 11-Ck, and NM which are connected in series every ...
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JP3553545B2 |
A reconstruction filter is described. An input is configured to receive an output signal from a digital to analog converter. An input sampling circuit is operative to store a sample of the output signal from the digital to analog convert...
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JP3530587B2 |
PURPOSE: To prevent the occurrence of disturbance of a signal by a transitional condition after variable gain is changed by correcting a value of a state variable so as to be in direct proportion to correction of an amplification/attenua...
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JP3529638B2 |
To insert a delay device that can delay by one block such as a D/A converter DAC to a main negative feedback loop FB0 in a ΔΣ modulation circuit provided with switched capacitor integration devices. An output of a D/A converter circuit...
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JP3512292B2 |
To constitute a large-scale highly parallel system, having operation elements coupled closely with one another, in one chip by using a device which has a floating node. Capacity means 8-13 are connected to input terminals 16-21 respectiv...
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JP2004048726A |
To provide a driver circuit improved for realizing a decrease in power consumption of an integrated circuit, or the like.An integrated circuit driver includes an output stage having source drain paths of a PFET and NFET connected in seri...
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JP3491226B2 |
To realize the delta and sigma modulator whose in-phase mode range is improved without the need of circumstantially narrowing a dynamic range. A differential integrator is provided with a differential integration amplifier OP1, input cap...
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JP2004007529A |
To provide a switched capacitor filter circuit which reduces feedthrough noise.The circuit is provided with a first noise compensating transistor 108 whose drain and source are connected to a switching transistor 101 to which a switching...
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JP3483565B2 |
A method and apparatus for integrating a plurality of analog input signals. A first integrator(725) having a first pole frequency integrates a first of the input signals and a second integrator(730) having a second pole frequency differe...
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JP3481286B2 |
PURPOSE: To provide a programmable capacitor switching circuit whose function can be set by a user. CONSTITUTION: This circuit is provided with a capacitor 2, the 1st and 2nd switch circuits SC1 and SC2 which are placed at both sides of ...
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JP3465951B2 |
PURPOSE: To match positive and negative delays with each other and to exactly match negative and positive coefficients by transferring the charge of a feedback capacitor means to an output capacitor means during the period of a second sw...
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JP2003317026A |
To provide a signed product sum computing element using a capacitor and an analog matched filter which includes it.Provided are the signed product sum computing element, including the capacitor 326 holding a voltage for an input signal, ...
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JP2003289264A |
To provide a receiver adjustable to various reception signal bands with ease, and suitable for semiconductor integration.The receiver which directly converts a reception signal into a base band signal, comprises a switched capacitor filt...
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JP2003234641A |
To implement circuits with switched capacitors, such as a ladder filter, so that they can be continuously tuned.In an integrated circuit with the switched capacitor, the switched capacitor is implemented as a DC-isolated variable capacit...
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JP3435330B2 |
To simplify an IF filter of the receiver and to improve a phase noise characteristic of a synthesizer. This receiver is provided with a frequency conversion means 2 that coverts a received high frequency signal into an intermediate frequ...
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JP3432718B2 |
To smoothly and easily control a multiplier coefficient corresponding to the type of a sound source and the type of music in a delta sigma modulation circuit modulating analog or multi-bit input acoustic signal to one bit digital acousti...
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JP3429426B2 |
To prevent deterioration in the arithmetic accuracy due to residual charges in the filter circuit using an analog arithmetic circuit. An input analog signal is sequentially sampled and held by each of sample-and-hold circuits H1-H16, mul...
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JP2003198393A |
To provide a noise removing circuit which can be integrally formed on a semiconductor substrate and can improve the accuracy in noise component removal.The noise removing circuit is provided with a high-pass filter for detecting noise co...
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JP3424549B2 |
To provide a switched capacitor circuit capable of reducing a circuit scale and power consumption. This switched capacitor circuit is provided with a first holding means 201, a second holding means 202, a transconductance amplifier 33, a...
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JP2003168067A |
To provide an arithmetic circuit capable of fast performing arithmetic processing without increasing a layout area and without lowering arithmetic accuracy.This arithmetic circuit is provided with a differential amplifier, a capacitor fo...
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JP2003143008A |
To provide a D/A converter which applies band-limiting on its analog output to obtain desired frequency characteristics, irrespective of process variations.The D/A converter is a filter for converting a multi-bit digital input to an anal...
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JP3396580B2 |
To provide a high performance switched capacitor differential circuit with a simple circuit configuration so that the state of two differential paths is not affected by an input signal. The MOS switching circuit 1 provides an independent...
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JP3393138B2 |
A combined programmable gain and integrating amplifier comprises an operational amplifier having an inverting input terminal coupled to a reference voltage. A plurality of capacitors are selectively connectable in parallel between the in...
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JP3392670B2 |
To provide a sampling device capable of converting modulated signals to a low frequency without using the mixer circuit of high accuracy or the filter of steep characteristics. After sampling the modulated signals received by an antenna ...
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JP3391249B2 |
To provide a delay circuit in which low frequency noise disturbance can be removed. At the time of writing, an input analog signal Vin is stored in odd number memory cell M1, M3,..., Mn-1 and an inverted input analog signal Vin is stored...
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JP2003510973A |
A multiple channel signal processing circuit receives an input associated with a first channel and an input associated with a second channel. The respective inputs are sampled and processed by the circuit, which generates a sampled outpu...
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JP2003078365A |
To solve the problem that an offset of several mV to several tens of mV due to working precision, manufacturing irregularity, etc., is generated in an operational amplifier, when an operational amplifier circuit of a switched capacitor a...
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JP3378722B2 |
To enable stable detection with malfunction reduced even if a sensor is continuously used for a long time by controlling voltage to be applied to a space between two electrodes of a detection means by pulses from a pulse generation circu...
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JP3372570B2 |
The switched-capacitor differential amplifier circuit of the present invention employs a more efficient switched-capacitor network to provide a common mode range which is not limited by the amplifier power supply, and to achieve a high c...
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JP2002541709A |
A hybrid loop filter includes an integrator having an input and an output wherein the output forms an output of the hybrid loop filter, a plurality of transconductance amplifiers having an input and an output wherein each output of the p...
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JP3336463B2 |
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JP2002534891A |
Digital-to-analog conversion circuitry 100 is shown including a path for processing data in a 1-bit format. First portion of an analog finite impulse response filter 300 includes pre-selected number of delay elements 301 for receiving st...
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JP3324527B2 |
To reduce temperature dependence in the gain of a gain control circuit. A clock signal from an oscillator 1 is inputted to a frequency divider circuit 2 and a constant number (gain control constant) from the outside is inputted from a co...
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JP3323493B2 |
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JP3320594B2 |
An object of the present invention is to provide a matched filter circuit of small size and consuming low electric power. Paying attention that a spreading code is a 1 bit data string, an input signal is sampled and held as an analog sig...
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JP3313783B2 |
PURPOSE: To improve the speech quality of a mobile telephone system by integrating the compander in other functions of mobile telephone by controlling a switching capacitor amplifier for a compressor and an expander by an exclusive OR ci...
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JP3308243B2 |
To enhance the accuracy of D/A conversion and A/D conversion. A switch circuit conducts a selective operation that includes an action of discharging or charging selectively at least either of 1st and 2nd capacitors and an action of selec...
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JP3307923B2 |
An electronic filter for filtering an electrical signal. Signal processing circuitry therein includes a logarithmic filter (81) having a series of filter stages with inputs and outputs in cascade and respective circuits associated with t...
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JP2002190721A |
To reduce the influence of the on-resistance of a switch, to enlarge a dynamic range and to realize speed-up in a switched capacitor circuit.The circuit includes an operation transconductance amplifier (10), a feedback stage having a fir...
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JP2002158962A |
To realize frequency characteristics sufficiently available for extracting a luminance signal or a chrominance signal with satisfactory reproducibility in a relatively simple and small-scaled circuit constitution, for example, a recordin...
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JP2002158333A |
To provide a variable capacitance element in which the variable capacitance is not discrete, the capacitance can be varied up to a high level, the polarity does not exist, and an IC can be implemented while reducing the size.The variable...
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JP3266031B2 |
To adjust a ΔF (difference between a resonance frequency and an anti-resonance frequency) and a capacitance or the like by increasing a degree of freedom of characteristic design, reducing spurious radiation and increasing the ΔF. A pi...
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JP2002064380A |
To provide a method and a device for attenuating spurious interference frequency signals in a communication signal with less parts with small power consumption.An analog signal is sampled at plural points of time and converted into a dig...
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JP2002033643A |
To obtain a switched capacitor circuit device that can realize reduction in an offset error caused by an unnecessary high frequency component with a proper configuration.The switched capacitor circuit device is provided with a 1st switch...
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JP3232568B2 |
A level detector detects an input signal level. A rectifier (210) receives the input signal and provides a rectified signal. A prefilter (220) receives the rectified signal and attenuates high frequency components at frequencies near mul...
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JP3220672B2 |
To quantity high measuring accuracy and enable is simple production by equalizing a first electric potential to a second electric potential being an auxiliary electric potential and making a first and second capacitors partial capacitors...
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