Signal translating circuit with compensated transient response
First Claim
1. Signal translating apparatus comprising:
- a signal path including a source of signal voltage to be translated;
signal translating means having an input and an output;
current amplifier means having input and output terminals exhibiting a parasitic capacitance therebetween;
first means for coupling said signal source to said input of said translating means and to said output terminal of said current amplifier means; and
second means comprising a low output impedance voltage source, for coupling translated signals from said output of said translating means to said input terminal of said current amplifier means for causing said current amplifier to conduct an output current representative of translated signals to said signal source;
whereinthe impedance presented to said input terminal of said current amplifier means is primarily determined by said low output impedance of said voltage source.
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Accused Products
Abstract
A signal voltage from a signal processing path is coupled via an interfacing terminal to an input port of a filter, the output port of which is connected to the base input of a current source transistor to supply thereto a signal voltage which exhibits the filter transfer function. The collector output of the current source transistor is also coupled to the interfacing terminal and conducts a current exhibiting the filter transfer function to the signal path via the interfacing terminal. The base input of the current source transistor is driven with filter output sigals via a low output impedance voltage source (e.g., an emitter follower stage). The impedance presented to the base of the transistor is primarily determined by the low output impedance of the voltage source.
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Citations
10 Claims
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1. Signal translating apparatus comprising:
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a signal path including a source of signal voltage to be translated; signal translating means having an input and an output; current amplifier means having input and output terminals exhibiting a parasitic capacitance therebetween; first means for coupling said signal source to said input of said translating means and to said output terminal of said current amplifier means; and second means comprising a low output impedance voltage source, for coupling translated signals from said output of said translating means to said input terminal of said current amplifier means for causing said current amplifier to conduct an output current representative of translated signals to said signal source;
whereinthe impedance presented to said input terminal of said current amplifier means is primarily determined by said low output impedance of said voltage source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An electrical signal processing circuit comprising:
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a source of signals; first and second transistors each having a base input electrode, a collector output electrode and an emitter electrode, said collector and emitter electrodes defining main current paths for said transistors; means for coupling said signal source to said base electrode of said first transistor; an output impedance coupled to said collector electrode of said first transistor; means for coupling said main current paths of said first and second transistors in series; an electrical signal filter with an input coupled in common to said emitter of said first transistor and said collector of said second transistor, and an output; and a third transistor with a base input coupled to said filter output, and an emitter output for providing filter output signals to said base input of said second transistor;
whereinthe impedance presented to said base input of said second transistor is primarily determined by the emitter output impedance of said third transistor.
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Specification