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JPS644128A |
PURPOSE: To obtain an LPF following surely a change in a sampling frequency with simple circuit constitution by setting a switching frequency to drive a switched capacitor filter to a constant multiple of a PCM sampling frequency. CONSTI...
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JPS63200922U |
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JPS6366451B2 |
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JPS63299406A |
PURPOSE: To reduce the size of a chip and current consumption, by arranging an attenuator consisting of a switched capacitor circuit having a capacitor charged/discharged by an analog switch, and an operational amplifier between a signal...
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JPS6359608B2 |
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JPS6358491B2 |
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JPS6358492B2 |
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JPS6358490B2 |
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JPS63265459A |
PURPOSE: To allow a power source noise Vn which is mixed in through a substrate to be shielded by a region with opposite conductivity type grounded region and prevent its noise from reaching a signal line by earthing one region of one el...
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JPS6351571B2 |
A switched-capacitor circuit (50) for passing an audio frequency over a predetermined range of frequencies fabricated on a monolithic semiconductor substrate is provided. The switched-capacitor filter (50) includes a first amplifier (60)...
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JPS63156119U |
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JPS63156120U |
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JPS63242016A |
PURPOSE: To obtain a filter with an optional characteristic by providing a switched capacitor equivalent resistance circuit 1 capacitor circuit, a connection analog switch, a clock signal circuit and a rewritable nonvolatile memory. CONS...
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JPS63240115A |
PURPOSE: To obtain an LPF with a simple constitution by opening other terminal of a switch whose one selected terminal is connected to a signal input terminal and keeping the voltage of a capacitor connected to the selecting terminal dur...
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JPS6348451B2 |
A multiplexed filter with n channels comprises at least one amplifier G2 with n feedback capacitors C5 to C8 associated with the switches S5 to S8. A switch-controlled resistance R2 (C'r, K5, K6, K7, K8) is connected to its input. Switch...
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JPS63227111A |
PURPOSE: To obstruct a level variation and a phase deviation in a filter output signal by providing a band-pass filter constituted of a switched capacitor circuit in accordance with a prescribed input signal, and a clock signal generatin...
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JPS6347282B2 |
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JPS63227112A |
PURPOSE: To obtain a filter circuit having a high performance by controlling a timing between P and N channel MOS transistors by a timing circuit, and feeding back an output signal of the filter circuit to a timing control circuit, in a ...
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JPS63217829A |
PURPOSE: To reduce the nonlinear distortion or to decrease the occupied area of a post filter by sending an output to the post filter by a time set by the transient response. CONSTITUTION: A changeover switch S is provided between the ou...
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JPS6342884B2 |
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JPS63502133A |
An enhanced quadrature notch filter which is capable of rejecting an undesired signal component of an input signal, generally comprising a quadrature phase splitter for producing first and second reference signals which have substantiall...
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JPS63196109A |
PURPOSE: To prevent any noise from being generated in an output when the titled circuit enters the selecting state by fixing a level of a terminal of a circuit characteristic variable capacitor not selected to a specific voltage level so...
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JPS6340495B2 |
A switched-capacity amplifier formed from integrated capacities has undesirable parasitic capacities that are large and variable on only one terminal of each of the capacities. A voltage-follower stage is connected to this terminal of ea...
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JPS6329298Y2 |
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JPS63191408A |
A filter comprises an amplifier circuit arrangement having a signal input (1) and a signal output (8) and a coupling (36) between a point (37) on a signal path (39) to the signal input and a point (38) on a signal path from the signal ou...
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JPS63182907A |
PURPOSE: To surely decrease field-through noise by constituting the titled switched capacitor by a switching circuit where a couple of complementary MOS transistors (TRs) are connected in parallel, and a capacitor and varying the level a...
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JPS6336580B2 |
A high-pass switched capacitor biquadratic filter based on the bilinear z-transform. The filter comprises first and second integrating operational amplifiers connected in series and in combination with a third operational amplifier that ...
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JPS6336581B2 |
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JPS63171014A |
PURPOSE: To make a switched capacitor circuit into an LSI by providing a capacity having a switching means in parallel between a signal input terminal and the inverted input terminal of an operational amplifier to set the capacity of a d...
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JPS63169138A |
Arrangement for decoding a stereo multiplex signal, comprising a baseband stereo signal (L+R), a stereo difference signal (L-R) which is amplitude-modulated on a suppressed sub-carrier and a pilot signal located between the frequency ban...
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JPS6335125B2 |
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JPS6335126B2 |
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JPS6334647B2 |
A signal processing system which can be readily adjusted to achieve a desired complex transfer function of arbitrary form. The system comprises a frequency sampling filter system from each individual filter of which in-phase and quadratu...
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JPS6334650B2 |
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JPS6334649B2 |
A low pass-filter for low frequency signals having first portions situated above on one side and second portions situated on the other side of an average value. The filter comprises at least two integrators, each comprising a capacitor, ...
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JPS63156416A |
PURPOSE: To suppress the rise of the ON resistance of an analog switching MOS transistor without increasing the size of the transistor, by connecting a boosting capacitance between the output terminal of a delay circuit and the gate of t...
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JPS6329849B2 |
A switched-capacitor filter circuit having at least one simulated inductor and having a resonance frequency which is one-sixth of the sampling frequency as pulse-controlled switches co-operatively operable for connecting a first capacito...
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JPS63138810A |
PURPOSE: To eliminate an error caused due to the wiring capacitance by providing an operational amplifier connecting an inverted input to the 1st, 2nd and 3rd discharge switches of the 1st, 2nd and 3rd sampling capacitor. CONSTITUTION: A...
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JPS63121311A |
PURPOSE: To simutaneously obtain all the Fourier-transform outputs and to output them as sine waves corresponding to the degrees of basic frequency with a simple constitution by connecting plural delay means with switched capacitors in a...
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JPS63116511A |
PURPOSE: To remove a direct current component regardless of the signal component included in the input in a short time without generating the phase dislocation with an output signal by specifying the amplification factor of an amplifier ...
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JPS6318079Y2 |
A reverberation apparatus is formed of bucket brigade delay circuit having its input connected to a signal source. An output of the delay circuit is connected through a spring-type reverberator to one of two inputs of an adder, the other...
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JPS6367874U |
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JPS6321361B2 |
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JPS6361817U |
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JPS6314495Y2 |
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JPS6390910A |
PURPOSE: To constitute arbitrary filters (LPF, HPF, BPF, BEF) by setting a frequency division ratio of a programmable frequency devider from the outside. CONSTITUTION: registers 121∼124 are provided in order to give arbitrary frequency...
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JPS6382117A |
PURPOSE: To contrive to decrease the circuit current by replacing a resistor into an equivalent resistance block formed by circuits of parallel connection each having two switches whose drive clocks are inverted to each other between the...
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JPS6352316U |
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JPS6373710A |
PURPOSE: To prevent increase in current consumption corresponding to the band setting of an operational amplifier used for a switched capacitor filter by generating a bias voltage in response to a frequency of a drive clock. CONSTITUTION...
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JPS6312402B2 |
PURPOSE:To decrease the number of power terminals and to facilitate IC-implementation by using only one power source for operational amplification as a power source. CONSTITUTION:A switched capacitor circuit 70 switches a switching capac...
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