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JP3216604B2 |
To obtain a switched capacitor type D/A converter which can shorten a reset period without increasing a circuit scale by providing a voltage source and a switch for forcibly setting the output of an operational amplifier to a specific vo...
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JP3216490B2 |
To apply the filter process to the analog signals of plural channels without increasing the circuit scale. The integration means Ik and Ik+1 successively carry out the integration processing constituting the filter processing to every ch...
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JP2001274687A |
To evade an overshoot, etc. A mixed signal CODEC comprising an improved sigma-delta ADC (20) is publicly opened, it suppresses an input signal to a switched capacitor structure and a circuit overhead is not added to a signal route. This ...
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JP3212721B2 |
PURPOSE: To constitute the PLL with irreducible circuit elements and to structure it as an integrated circuit even when the time constant is extremely large in integrating operation. CONSTITUTION: Corresponding to an instantaneous value ...
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JP2001251165A |
To provide an SCF capable of making a detection level error generated by the phase shift between an input signal fin and a sampling frequency fs smaller without increasing the number Nc of the stage of a capacitor.A frequency dividing ph...
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JP3187261B2 |
PURPOSE: To maximize the signal to noise ratio S/N even when the level of an adjacent signal is high by changing the gain of a filter system in response to the magnitude of an in-band signal level. CONSTITUTION: The filter circuit is pro...
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JP3184782B2 |
To effectively reduce higher harmonic wave distortion by utilizing an analog switch and a capacitor for a digital/analog(D/A) converting part without using any bypass capacitor. A D/A converting part 60 is composed of a reference voltage...
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JP3181848B2 |
To prevent the flowing out of an electric charge stored in a capacitor through the Pn connection of a switch circuit by newly providing two switch circuits for the switch circuit of a switched capacitor circuit, serially connecting two c...
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JP3179252B2 |
PURPOSE: To obtain a notch filter circuit which is programmable with respect to its notch width and depth. CONSTITUTION: A first switching capacitor resistor 37 is connected between the inputs of a filter circuit and a first amplifier an...
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JP3162742B2 |
PURPOSE: To protect leak of source sound by sampling input analog signals in synchronous with a predetermined clock signal, and by giving the sampling result to the first switch to enhance the frequency conversion precision from source s...
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JP3150537B2 |
PURPOSE: To effectively attenuate high frequency component included in a digital signal by outputting a signal which is average-moved with respect to the digital input signal of one bit in the constitution of delaying or inverting one of...
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JP2001068938A |
To provide a receiver of a telephone set that can suppress noise even when one terminal of an electroacoustic transducer is connected to ground without the need for a filter element. The receiver part of the telephone set is provided wit...
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JP3143567B2 |
PURPOSE: To eliminate a component adjusted to an offset, to reduce noise and to improve the S/N of modulation output by deciding a charge moving from a DA conversion circuit to an integrator by means of the capacity of a capacitor withou...
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JP2001053586A |
To provide an integration circuit, an A/D conversion circuit and an integration method capable of accurately improving integration characteristics. In this circuit, provided with a capacitor C connected in parallel to an operation amplif...
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JP3132064B2 |
PURPOSE: To reduce the sampling noise without using a low pass filter. CONSTITUTION: A switched capacitor integrator is provided with a capacitor 1, C-MOS analog switches 2 to 5, an operational amplifier 6, and an integrating capacitor 7...
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JP3128647B2 |
To highly precisely process the analog signal of a low frequency range by generating the pole of the transfer function of a single output operation amplifier means, taking in the output of the single output operation amplifier means and ...
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JP3129043B2 |
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JP3124730B2 |
To prevent a circuit scale from increasing and the process of circuit generation from being complicated and to provide a chopper comparator circuit with high accuracy. This chopper comparator circuit is provided with an MOS transistor 1,...
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JP3120182B2 |
This invention relates to semiconductor integrated circuits concerned with the realisation of different value capacitive components of a semiconductor chip by means of programming control arrangements. Programmable (IC) capacitors are im...
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JP3113024B2 |
PURPOSE: To bias an operational amplifier circuit properly and to attain a broad band for the operational amplifier circuit. CONSTITUTION: Junction FETs 46, 47 are used for input transistors(TRs) pairs of an operational amplifier circuit...
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JP3110430B2 |
A tunable drain-biased transresistance (DBT) device for generating accurate linearly variable RC values employs first (M1) and second (M2) matched MOS transistors connected in first and second series circuits with third (M3) and fourth (...
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JP3109263B2 |
PURPOSE: To reduce a circuit size and power consumption when delay is realized for a long time at the sample-and-hold delay circuit. CONSTITUTION: An input voltage v1 is charged to capacitors 2, 5 and 8 respectively at every one sample c...
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JP3108281B2 |
PURPOSE: To realize the delta sigma type A/D converter circuit in which number of components is reduced and switching noise is reduced by decreasing number of switches. CONSTITUTION: An input signal VIN is given to one terminal of an inp...
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JP3101947B2 |
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JP3089633B2 |
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JP3086743B2 |
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JP3083824B2 |
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JP3082090B2 |
A switched current integrator circuit is provided with a feedforward input (32) which is connected to the input of a first current memory cell (T31, T32, S31, C31) during a portion phi 1 of each sampling period and to the input of a seco...
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JP3079368B2 |
To correctly obtain output without variation in the potential at a virtual ground terminal even in the case of abrupt variation in input voltage by connecting two input capacitors in series. So that abrupt variation of an input signal ex...
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JP2000222515A |
To reduce the energy consumption by setting one input terminal of an active element to a potential independent of an input signal during the time of first and second stages. An integration capacitor Co is fixedly connected with the drain...
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JP3074973B2 |
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JP3074632B2 |
PURPOSE: To minimize an holding error when analog data are set in holding and transferred by using a changeover means to allow any capacitor to hold selectively an input voltage and leading a charge of the capacitor to a capacitor of a p...
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JP3070237B2 |
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JP2000201054A |
To reduce the load of switching to be imposed on a reference voltage by imposing a voltage in an intermediate level through a switch on a sample/ hold capacitor. In the active phase of a sample clock, switches 37+, 37-, 38+, and 38-are c...
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JP2000151358A |
To set the cutoff frequency of a filter device with high precision. Switches S1 and S2 at both the ends of a capacitor Cr of an adjusting circuit 100 are switched at a frequency fck and the capacitor functions as a dummy resistance. An o...
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JP2000138543A |
To provide an amplifier circuit which does not consume much electric power and has a wide operating frequency band a small layout area and the output of which can be settled in a short time. This amplifier circuit amplifies differential ...
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JP2000124774A |
To reduce noise generated by an operational amplifier.A switched capacitor 10i provided with a capacitive element Ci and the capacitive element C are arranged in a feedback path between the output terminal and inverted input terminal of ...
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JP3037502B2 |
PURPOSE: To realize a long time delay and to reduce the scale of a circuit and power consumption by doubling as much as conventional delay amt. in a sample-and-hold delay circuit. CONSTITUTION: At the point of time of that a clock &phiv ...
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JP2000101397A |
To make reduce a circuit chip area and furthermore to improve high frequency characteristic at making a circuit integrated.A switched capacitor filter 1 is formed of a coefficient switched capacitor 3i, a delaying switched capacitor 5ij ...
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JP2000101394A |
To provide a filter circuit of a switched current type having a responding speed required of W-CDMA saving power consumption, while securing sampling precision required for constituting a matched filter and which can be used for a portab...
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JP3028827B2 |
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JP3024378B2 |
PURPOSE: To reduce the degree of a back-end analog filter for removing unnecessary components near a sampling frequency present at an output signal of a sample.hold circuit. CONSTITUTION: Sample.hold circuits are formed at a non-invertin...
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JP3020487B2 |
To provide a comb-line filter which eliminates the need for a capacitive element of large capacitance and is easy to be constituted as single LSI. Comb-line frequency characteristic is realized by first and second delay circuits 12 and 1...
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JP2000022500A |
To provide a circuit whose transfer function is not fluctuated by a DC offset voltage of an operational amplifier. A switched capacitor A1 is configured by a capacitor 2 and switches 4-7, the switched capacitor A1 connects to an invertin...
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JP2999468B2 |
The method involves exciting a reactance (10) by a pulse-controlled generator (12), using an electric voltage, an electric current or an electric charge. A pulse-controlled evaluator (14) produces an output signal as a function of the re...
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JP2000013155A |
To reduce power consumption by connecting a bias switch to the gate of a current power MOS transistor in an FET operational amplifier, selectively connecting a plurality of bias voltages to the gate with the bias switch and reducing supp...
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JP2994309B2 |
To reduce the circuit scale and to simplify the control method by eliminating the need for one set in two sets of capacitors and switches in a conventional circuit and having only to control a polarity control signal and a frame signal t...
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JPH11355113A |
To prevent the occurrence of an operation error occurred by means of the output of an odd stage by connecting a plurality of neuro-amplifier circuits inverting and outputting input voltage in series, generating compensation voltage simil...
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JPH11353407A |
To enable a neuro amplifier of a single stage to perform both addition and subtraction by refreshing an inverter so as to set the output of the inverter at the reference voltage level and switching the input voltage levels in a state whe...
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JPH11355101A |
To reduce the circuit scale of a filter by holding analog data corresponding to a filter characteristic, executing a product-sum operation with digital data on analog data making the number of bits on the filter characteristic to be larg...
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