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JPS6292513A |
PURPOSE: To make the value of an equivalent inductance accurate by using two sets of switched capacitors so as not to connect both the capacitors to the same terminal by means of the switch control at the same time. CONSTITUTION: Two swi...
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JPS6269717A |
PURPOSE: To reduce the number of operational amplifiers and to obtain an analog delay line excellent in a noise characteristic by using a switched capacitor type amplifier instead of a sample holding circuit so as to use the operational ...
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JPS6212703B2 |
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JPS6212702B2 |
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JPS6212701B2 |
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JPS6211812B2 |
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JPS6210442B2 |
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JPS6251313A |
PURPOSE: To reduce the processing level of a small signal by providing the 1st∼4th parallel circuits connected especially respectively and the 1st and 2nd series circuits and not making the capacitance of the 7th capacitor zero and not...
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JPS6251312A |
PURPOSE: To reduce the processing level of a small signal by providing the 1st∼4th parallel circuits connected especially respectively and the 1st and 2nd series circuits so as to suppress an offset voltage lower. CONSTITUTION: The 1st...
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JPS6249422A |
PURPOSE:To obtain the titled circuit which is strong against a temperature variation and whose power consumption is small, and also to use it in a circuit in which a supply power source voltage is low, by boosting the supplying power sou...
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JPS6245211A |
PURPOSE: To adjust the selectivity of a switched capacitor filter by dividing a switched capacitor equivalent resistor into two groups and making its clock frequency different. CONSTITUTION: The switched capacitor filter is provided with...
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JPS628042B2 |
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JPS6235705A |
PURPOSE: To easily correct or reduce an error in an analog signal with small- scale constitution by mixing analog signals mutually and delaying one of the analog signal which is inputted to a switched capacitor by one sampling period. CO...
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JPS625372B2 |
A filter circuit (16 min ) is disclosed, comprising a switched capacitor filter (21), and, at its input stage (40), a plurality of switched capacitors (41-1, 41-2, 41-3). The switched capacitors, connected in parallel with each other, re...
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JPS6221317A |
A switched-capacitor multiplier circuit is described for multiplying an information signal x(t) by a bipolar carrier signal d(t), comprising a distributed multiplier circuit (20) with which the bipolar carrier signal is normally associat...
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JPS61280111A |
PURPOSE: To avoid the effect of the pre-stage by providing an impedance conversion circuit such as a voltage follower circuit between an output of at least a filter circuit and the input of the next filter circuit. CONSTITUTION: The volt...
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JPS61276411A |
A decimating filter utilizing first and second switched input capacitors for sampling an input signal on opposite phases of a first sampling clock signal. The switched input capacitors are connected to an integrating circuit for filterin...
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JPS61273009A |
PURPOSE: To save the mounting space of a filter circuit by constituting two kinds of band-pass filters which have been made up of a coil, a resistor and a capacitor with a switched capacitor filter. CONSTITUTION: The titled circuit consi...
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JPS61269511A |
PURPOSE: To decrease number of elements by using input variables to a node equation for an input, output and an integration device of the node equation and erasing other variables and modifying the equation so as to obtain a signal flow ...
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JPS61252705A |
PURPOSE: To prevent gain fluctuation due to the difference in stray capacitance by grounding a connecting point between the 1st switch means and the 2nd switch means via the 5th switch means and applying switch control to the 1st∼5th s...
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JPS61240711A |
PURPOSE: To eliminate a charge of an integral capacity by a period of an integer multiple of a sampling period by providing a switched capacitor integration circuit having the integral capacity for accumulating the charge, and a switch f...
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JPS61239714A |
An automatic linear compression circuit for a telephone «handsfree» loudspeaker is provided. The circuit consists of a variable attenuator the level of attenuation of which is controlled by the input signal level. The input signal is p...
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JPS6145409B2 |
A bandpass filter is disclosed which includes a low-pass filter and an analog delay circuit in which the delay time is set by a clock signal. THe analog delay circuit samples the voltage of the low-pass filter capacitor and delays the sa...
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JPS61224610A |
PURPOSE: To smooth an output waveform of a filter without a gain and phase error by providing a charge split type switched capacitor circuit dividing an electric charge by (n) and transfers them over n-time between an output terminal and...
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JPS6142893B2 |
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JPS6142450B2 |
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JPS6142449B2 |
The passive prefilter (61) is comprised only of a plurality of additional switched capacitors (62) which are added to a switched capacitor (63) common to a switched-capacitor filter (32). The switched capacitor (63) common to said switch...
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JPS6142451B2 |
A resonator circuit formed in MOS technology for scanned analog signals, wherein such circuits are constructed for use with accumulators and information processing is accomplished by means of switched capacitors which are charged or resp...
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JPS61208917A |
PURPOSE: To decrease number of components and to miniaturize the chip area by using a switched capacitor circuit having a positive/negative equivalent resistor in a notch filter circuit. CONSTITUTION: An input signal E1 connects to a cap...
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JPS61143322U |
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JPS61199318A |
PURPOSE: To obtain a steep filter characteristic by using a clock signal outputted from a clock circuit generating the clock signal changed in response to the change in the frequency depending on the frequency change in a filtering objec...
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JPS61198911A |
PURPOSE: To process a signal having various signal speeds at a low output noise by connecting a circuit having a switch and a capacitor operated at a frequency MfS (1
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JPS61198910A |
PURPOSE: To decrease number of transversal filter circuits by connecting a series circuit each comprising a switch and a capacitor, a switched capacitor circuit, a weighting circuit and a product sum circuit between the input and output ...
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JPS6138884B2 |
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JPS6138648B2 |
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JPS6138649B2 |
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JPS61194912A |
PURPOSE: To set ease of a cut-off frequency by forming a capacitor constituting a switched capacitor circuit and a capacitor constituting a filter circuit in the semiconductor substrate by the same device process and deciding the cut-off...
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JPS61194911A |
PURPOSE: To form a filter circuit passing a desired frequency signal by forming plural capacitors having substantially identical capacitance in the same semiconductor substrate by the same device process, forming a CMOS transistor (TR) s...
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JPS61191111A |
PURPOSE: To cancel the offset voltage of an operational amplifier without using an operational amplifier having a large through-rate by adding a delay feedback circuit in addition to a feedback circuit. CONSTITUTION: The delay feedback c...
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JPS61179610A |
PURPOSE: To eliminate a field-through voltage and to prevent the deterioration in the S/N by adding the 2nd switch comprising an MOS transistor (TR) the same size as that of an MOS TR constituting the 1st switch, and a resistor and the 3...
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JPS61179609A |
PURPOSE: To equalize the DC offset voltage included in an output when the characteristic is changed over by providing a switched capacitor charged with an output signal of a sampling switch and an integration means or the like comprising...
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JPS61177810A |
PURPOSE: To obtain a switched capacitor filter (cf) reduced the number of capacitors and its wiring area and variable at its transmitting function by using variable capacitors for obtaining a required capacitor value by binary weighted c...
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JPS61126813A |
PURPOSE: To prevent the polarity of a voltage across an MOS capacitor from being changed against an AC input signal voltage by using the gate-source capacitance of an MOS transistor and charging a bias electric charge synchronously with ...
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JPS61126814A |
PURPOSE: To use stably a capacitance of an MOS capacitor by using a gate- source capacitor of an MOS transistor so as to apply always a bias voltage to the MOS capacitor. CONSTITUTION: A signal adding a voltage VB of a bias voltage gener...
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JPS61121514A |
PURPOSE: To produce easily a monolithic IC by connecting in cascade an active LPF, switched capacitor LPF anda switched capacitor BPF. CONSTITUTION: An RC active LPF A, LPF B and an LPF C are connected successively to the first, intermed...
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JPS61121611A |
PURPOSE: To attain ease of monolithic circuit integration by making switching frequencies different and driving an equivalent resistor so that the product between the ratio of a maximum capacitance to the minimum capacitance of a capacit...
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JPS61109313A |
PURPOSE: To reduce the effect due to a parasitic capacitor of a switch by storing an electric charge of opposite polarity to a dummy switch so as to cancel the electric charge stored in a parasitic capacitor of a switch group at read of ...
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JPS61108217A |
PURPOSE: To obtain a variable pass band characteristic filter device acting excellently against a broad band input by providing a low pass filter having a cut-off frequency lower than the internal clock frequency of a switched capacitor ...
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JPS6117416B2 |
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JPS6184107A |
PURPOSE: To eliminate sudden change due to noise by processing three sampling values sampled continuously and sequentially at a prescribed time interval as specified. CONSTITUTION: A processor CPU stores a sampling value d3 obtained from...
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