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JPH02288719A |
PURPOSE: To surely prevent production of noise caused in an output of a capacitor type low pass filter SCLPF by providing a delay circuit to a clock signal generating circuit and setting the delay of the delay circuit to a time when a cu...
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JPH0252453B2 |
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JPH0252455B2 |
For adaptive line equalization of a time-division multiplexed analog signal, an offset-compensated filter circuit comprises a timing circuit for generating channel-switching signals respectively synchronized with the time slots of the TD...
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JPH02133018U |
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JPH02266607A |
PURPOSE: To set a cut-off frequency variably over a wide range without causing any noise on an output by varying a filter constant in a clock frequency rejection filter. CONSTITUTION: A filter characteristic (cut-off frequency) of a cloc...
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JPH0249580B2 |
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JPH02255994A |
PURPOSE: To obtain an analog arithmetic circuit, for which the required area of a chip is small, by providing a unit gain amplifier, forming the analog arithmetic circuit by the small number of high-speed elements and executing analog si...
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JPH0244416B2 |
The variable switched-capacitor filter (VSCF) comprises an input terminal (101), an output terminal (104) and first and second variable switched-capacitor filter blocks (102 and 103, resp.) each having a plurality of capacitors. In each ...
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JPH02246412A |
PURPOSE: To improve the current adding accuracy of a circuit device by providing a current adding node connected to the input of a current transmitting circuit to a means which couples the input sample current in the present sampling per...
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JPH0243365B2 |
An automatic adjustment circuit for adjusting the time constant of a filter circuit, which receives a reference signal having a predetermined voltage and a clock signal. The adjustment circuit includes an integration circuit for generati...
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JPH02235426A |
PURPOSE: To quicken the processing speed of the filter by supplying an input signal to an inverting input terminal of an operational amplifier via a switch switched with a 1st phase clock signal and connecting a prescribed added input ca...
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JPH02116114U |
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JPH02219314A |
PURPOSE: To reduce an area, to reduce power consumption, and to improve a filtering ratio by providing a full differential arithmetic amplifier having two inputs and two outputs, and a pair of feedback circuit respectively having two cap...
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JPH02214323A |
PURPOSE: To control the cut-off frequency adaptively in response to the signal component with a low frequency included in an input audio signal by providing a control means controlling the cut-off frequency in response to the power of a ...
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JPH02213215A |
PURPOSE: To realize a circuit with an equivalently large capacitance ratio with combination circuits with a small capacitance ratio by providing an input section being a 1/N circuit diving an input signal into 1/N formed by a switched ca...
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JPH0232808B2 |
Apparatus for reducing the fundamental and harmonic frequencies of hum in a signal comprising means for placing a plurality of signal storage means between an input to which the signal is applied and an output in repeated sequence that i...
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JPH02174415A |
PURPOSE: To reduce loopbacked noise detoured from a signal earth circuit by connecting other terminal of a capacitor whose one terminal connects to a noninverting input terminal of an operational amplifier to a power supply circuit of th...
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JPH0226407B2 |
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JPH0225565B2 |
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JPH0225290B2 |
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JPH0221687B2 |
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JPH0296417A |
PURPOSE: To reduce a circuit scale by selecting a capacitor in a switched capacitor filter(SCF) with a switch at a micro computer and selecting a clock frequency for driving an SCF. CONSTITUTION: A signal including all mode frequencies i...
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JPH0289413A |
PURPOSE: To decrease the gain at a high frequency region while suppressing a phase lag of a signal and to eliminate the mechanical resonance effectively by specifying a transfer function of a switched capacitor integrator whose gain is v...
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JPH0286310A |
PURPOSE: To control the integration speed of an analog signal digitally with high accuracy by providing an operational amplifier in which a feedback capacitor is connected between an integration output terminal and an inverting input ter...
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JPH0281516A |
PURPOSE: To attain initialization in a short time without overloading a power supply by short-circuiting a switching means at a smaller period than the time constant comprising a capacitive element with a large capacitance and a resistor...
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JPH0211173B2 |
An interpolation or smoothing filter circuit for a switched-capacitor system which transforms the sampled-and-held output signals from a switched-capacitor filter into sampled-and-held signals with a doubled sample rate. The circuit comp...
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JPH0211172B2 |
A switched-capacitor cosine filter for a sampled-data system functions to reject extraneous frequency components of an incoming analog signal around the sampling frequency, thereby avoiding aliasing. The filter comprises an operational a...
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JPH0268799A |
PURPOSE: To compensate an offset voltage due to the field through charge of an analog switch and to attain high accuracy by open/close-controlling a first analog switch and a second analog switch and holding an input signal to a first ca...
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JPH029483B2 |
The switched-capacitance amplifier comprises n capacitors C11 to C1n which are periodically switched in parallel and in series, the n parallel-switched capacitors being charged simultaneously by the same voltage VE. An amplified voltage ...
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JPH0255415A |
PURPOSE: To manufacture a product with a high capacity and a high dielectric strength by using a silicon thermo nitride film and a silicon nitride film as insulation films. CONSTITUTION: A polycrystal silicon film 102 is formed on a sili...
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JPH0255416A |
PURPOSE: To manufacture a product with a high capacity and a high dielectric strength by using a silicon oxide nitride film and a silicon oxide film as insulation films. CONSTITUTION: A polycrystal silicon film 102 is formed on a silicon...
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JPH0247912A |
PURPOSE: To simplify the constitution and to make the size of the filter small by combining a switched capacitor filter and a required filter preventing noise from the switched capacitor filter in a tracking filter for analyzing the vibr...
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JPH026452B2 |
A switched capacitor filter is designed utilizing two parallel switched capacitor charge pumps. These two, parallel charge pumps operate out of phase with each other, thereby allowing charging of a storage capacitor at a rate equal to tw...
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JPH026453B2 |
A dynamic amplifier comprises two complementary MOS transistors T1 and T2 which are connected in series, the gates G1 and G2 of which are connected to each other and to an input node by way of capacitors C1 and C2. The gate of T1 is conn...
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JPH025333B2 |
A switched capacity filter having capacities formed by MOS technology on a semiconductor substrate. The connection between two capacities whose first plates are formed by the semiconductor substrate are periodically connected by providin...
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JPH0229110A |
PURPOSE: To reduce interference noise by stopping a frequency divider generating a frequency divider signal not selected by a frequency divider signal selector. CONSTITUTION: A stop controller 1 provided in the inside of a switched capac...
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JPH023565B2 |
High-pass, low-pass and band-pass filters are obtained by combining switched-capacitance integrating networks.
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JPH0220112A |
PURPOSE: To easily make variable a filter characteristic in a software in accordance with the object to be used by mounting a switched capacitor filter, a clock signal oscillator and a microprocessor on the same semiconductor substrate. ...
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JPH0215708A |
PURPOSE: To avoid a steer step distortion, and to maintain stable feedback path characteristics by using a switched capacitor circuit which alternately samples a signal. CONSTITUTION: An input signal from an input node V1 is alternately ...
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JPH0211015A |
PURPOSE: To obtain an amplifier circuit which operates at a high speed and is small in an energy consumption by providing four switches at an operational amplifier circuit. CONSTITUTION: Switches S1-S3 between an input terminal 1 and one...
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JPH01317004A |
PURPOSE: To devise the circuit so as to change over even a minute capacitance less than a stray capacitance of a switch and a wire by adopting the constitution such that plural series circuits each comprising a capacitor and a switch and...
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JPH01314418A |
PURPOSE: To improve a PSRR characteristic without preventing the title device from reduction in cost of an integrated circuit by providing an inverting and amplifying circuit, which inverts a power source voltage noise and transmits it a...
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JPH0159768B2 |
An electrical filter circuit for processing analog sampling signals consists of N+1 capacitors interconnected to cyclically circulate N signal charges, the capacitors all being of approximately the same size, and interconnected with an o...
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JPH0158735B2 |
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JPH0153809B2 |
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JPH01278112A |
PURPOSE: To realize the offset erasion by setting an offset cancel circuit between a non-inverted input terminal and an output terminal of a 1st operational amplifier. CONSTITUTION: The capacity KC0 is connected between an output termina...
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JPH01272312A |
PURPOSE: To prevent the generation of a DC offset by constituting an input capacitor so that a transistor(TR) having the same size as a TR connected to an inverted input terminal of an operational amplifier to a non-inverted input termin...
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JPH01265710A |
PURPOSE: To form a small-sized automatic variable resistor circuit with high accuracy by varying the frequency divider ratio of two variable frequency dividers of a capacitor type amplifier circuit. CONSTITUTION: The circuit consists of ...
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JPH01259613A |
PURPOSE: To decrease the number of operational amplifiers to one and to reduce circuit scale by connecting a switched capacitor circuit in parallel in order to make a delay time and charging a capacity by shifting by one clock. CONSTITUT...
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JPH01256807A |
PURPOSE: To reduce an offset voltage remarkably with less total sum of capacitance by providing a circuit sensing an offset voltage of an operational amplifier and cancelling the offset voltage. CONSTITUTION: Switches S1-S5 are turned on...
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