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JPH01246914A |
PURPOSE: To reduce the load of an operational amplifier so as to prevent occurrence of an offset caused by a stray capacity by supplying a charging and discharging currents from a bias line against the stray capacity produced when a capa...
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JPH01246679A |
PURPOSE: To prevent an off-setting due to a floating capacity from generating by discharging or charging only the prescribed quantity of the charge of the floating capacity at the section which does not execute the integrating action. CO...
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JPH01243718A |
PURPOSE: To simplify the constitution of a switched capacitor filter itself, and to make unnecessary a clock preventing filter. etc., by forming a part of the switched capacitor filter with an active filter. CONSTITUTION: An input signal...
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JPH0143488B2 |
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JPH01233935A |
PURPOSE: To use only one oscillator provided externally by supplying a clock signal from a reference oscillator respectively to 1st and 2nd switched capacitor filters, frequency-dividing the clock signal and supplying the result to a mod...
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JPH01229517A |
PURPOSE: To improve yield by doubling in construction all capacitors concerned with Z-1 which is the parameter of the transfer function of a low-pass switched capacitor(SC) filter whose worst sensitivity goes to '0', and converting the p...
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JPH01212111A |
PURPOSE: To reduce energy consumption due to battery saving by closing an analog switch and short-circuiting the output terminal and inverting input terminal of an operational amplifier when it is detected by a clock detector that a driv...
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JPH01212112A |
PURPOSE: To prevent the off-set voltage of an operational amplifier from being increased by a clock stopping condition for a long time by adding respective multi-phase clock to one input of a two-input OR, which corresponds to the phase ...
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JPH01212120A |
PURPOSE: To cause the turning-on resistance of a switch to be low by connecting one electrode of boost lap capacity to a common connecting node and giving a signal, whose phase is reverse to the input signal of a complementary inverter, ...
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JPH01204518A |
PURPOSE: To obtain a large time constant by providing a common area for two sequential 1st and 2nd switching transistors(TR) in series arrangement and composing the capacitance principally of the parasitic capacitance of the common area....
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JPH01202012A |
PURPOSE: To obtain a low-voltage current mirror device which has high output impedance by guaranteeing the dynamic adaption of a signal level by a bias voltage. CONSTITUTION: A low-voltage cascode current mirror circuit device is include...
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JPH01202914A |
PURPOSE: To form an inexpensive anti-aliasing filter with small size tacking to a sampling frequency by using a switched capacitor filter and a programmable analog filter. CONSTITUTION: A low pass filter section 10 consists of a low pass...
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JPH0133970B2 |
PURPOSE:To obtain a spectral distribution at the same point of time by sampling channel signals in the same frame of a time-divided input signal at a low frequency respectively and extracting all channel signals in the same frame. CONSTI...
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JPH0133964B2 |
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JPH0133971B2 |
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JPH01160110A |
PURPOSE:To realize a highly accurate filter by using an output or an adder means as the final output so as to attain low sensitivity. CONSTITUTION:Voltages (V2<1>, V2<2>, V1<3>, V1<4>) at the output side of an SC filter circuit are added...
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JPH01155709A |
PURPOSE: To eliminate the need for the analog pre-filter and postfilter having been required for a conventional circuit by providing the roll of the pre-filter and post-filter of a consecutive time system filter on a block being a part i...
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JPH01146412A |
PURPOSE: To decrease the error voltage remarkably by applying negative feedback control so as to compensate the error voltage generated in one clock period within the succeeding clock period. CONSTITUTION: The constitution is employed su...
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JPH01144717A |
PURPOSE: To simplify constitution by providing a capacitor for switching the input of two other integrator circuits under the control of two disjoint clock states and mutually performing connection to the integrator circuit to linearize ...
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JPH01143517A |
PURPOSE:To obtain a filter circuit in response to the operation in the multi- mode without increase in the number of circuits by providing an oscillator varying a clock frequency depending on various transmission/reception modes and supp...
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JPH01140810A |
PURPOSE: To realize the improvement of an output characteristic with simple constitution by preventing the switching control of other switch elements when a switch element connected to the virtual ground input of an operational amplifier...
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JPH01137811A |
PURPOSE:To easily eliminate the noise due to sampling of a switched capacitor filter by using an analog filter. CONSTITUTION:MOSFET analog filters 2, 4 are active filters including capacitors 23, 24, resistors and an operational amplifie...
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JPH0126565B2 |
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JPH0125446B2 |
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JPH0122767B2 |
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JPH0122768B2 |
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JPH0198312A |
PURPOSE: To attain large scale integration by obtaining each coefficient of a transfer function on the S plane in a consecutive time system frequency region by which the frequency characteristic of the filter is able to be evaluated so a...
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JPH0119653B2 |
The electronic filter has three integrating operational amplifiers (12, 14, 16) connected in series. An input voltage (Vin) to be filtered is supplied during alternating clock pulses (phi, phi') to the first integrator (12) from a capaci...
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JPH0117291B2 |
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JPS6471315A |
PURPOSE: To prevent a circuit block from being affected by the gain change of an operational amplifier by constituting the circuit block to provide a prescribed filter function by selecting sensitivity for the change in the gain of the o...
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JPS6471314A |
PURPOSE: To simplify the configuration by providing an upstream switching means and a downstream switching means for a basic cell. CONSTITUTION: A switched capacitor sampling filter is composed of a basic cell 2, upstream switching means...
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JPS6468011A |
PURPOSE: To realize an automatic level control circuit with a MOS integrated circuit by converting the variance of an input level to the change of the sampling frequency of a first switched capacitor and moving the frequency characterist...
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JPS6466915A |
PURPOSE: To eliminate the directional properties of an etching rate, and to improve specific accuracy between semiconductor capacitance elements by forming the shape of at least one of a lower electrode and an upper electrode for a funda...
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JPH0113766B2 |
In a switched capacitor circuit, in order to eliminate leakage of a power supply noise component to a signal line through an input capacitance of an operation amplifier, a power supply noise component having the same phase as that of an ...
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JPS6459533A |
PURPOSE: To reduce the number of parameters which affects on the accuracy of an output signal, by using a capacitor which supplies plural input signals to the input of an operational amplifier in common. CONSTITUTION: The output of input...
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JPH0113246B2 |
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JPS6454808A |
PURPOSE: To attain cost reduction by making a 2nd clock signal asynchronous with a 3rd clock signal and setting the 3rd clock signal to the integer relation with a 1st clock signal through 1st and 2nd frequency dividing means. CONSTITUTI...
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JPS6450616A |
PURPOSE: To reduce power consumption by constituting the n-order (n is a natural number) filters of n-set of differential amplifying circuits and ≥n-set of bias circuit cells. CONSTITUTION: For example, a 3rd order of switched capacito...
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JPS6449311A |
PURPOSE: To raise the control accuracy of ON/OFF of a capacitor, and also, to allow a switched capacitor filter to have a characteristic of high accuracy, by executing definite sequencing to generated clocks of four pieces of clocks 1∼...
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JPS6448514A |
PURPOSE: To reduce the error voltage by using an auxiliary capacity provided in parallel with a capacitor of the main body and the main capacitor so as to branch an error voltage due to clock feed-through having voltage dependancy. CONST...
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JPS6410968B2 |
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JPS6429919U |
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JPS6410131B2 |
An easily integratable switched-capacitor filter circuit which can be employed to simulate a parallel resonance circuit has an operational amplifier having an inverting input connected to a first circuit node through a first switch, a ca...
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JPS6428030U |
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JPS648927B2 |
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JPS647524B2 |
A switched capacitor filter is designed utilizing two switched capacitor charge pumps connected in series. These two charge pumps operate with different clock frequencies thereby allowing charging of a storage capacitor at a higher frequ...
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JPS646572B2 |
A Delta-Sigma modulator for one-bit analog to digital conversion of a signal (U(t)), such as a telephone voice channel signal to digital form is disclosed. The voice signal is sampled (1, 3, C1) at a rate high compared to the highest voi...
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JPS6430318A |
PURPOSE: To vary a band in a wide range by using a variable capacitor capable of generating an element value which is the multiple of reciprocal of an arbitrary integer of a basic value at a special range by the ON and OFF control of a s...
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JPS6417176A |
PURPOSE: To prevent an adverse influence due to a parasitic capacity by having a switched capacitor provided with a switch consisting of a capacitor in which a form and the capacity are unified and a MOS transistor in which the form is u...
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JPS6416010A |
PURPOSE: To adapt the titled filter to a monolithic IC by connecting an interpolation circuit to the output side of a switched capacitor filter (SCF) and outputting an output of the SCF and an output of the interpolation circuit switchin...
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