Pulse code transmitter and receiver designed to produce uniform

Details Pulse code transmitter and receiver designed to produce uniform Pulse code transmitter and receiver designed to produce uniform

1975-12-10

1977-08-02

Griffin, Robert L.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 11D, H04B 100

Patent

active

040399508

ABSTRACT:
A pulse code modulation transmission device comprising a transmitter and a receiver each being provided with a dynamic control circuit and a modulator built up of a first controlled current source circuit supplying a supply current for a difference amplifier which is controlled by output pulses from the transmitter and incorporating in its two output circuits pnp current mirror circuits whose outputs are connected to the output of a modulator directly and through a precision polarity reversing circuit, respectively. The control input of the first current source circuit is coupled to the output of the dynamic control circuit as well as to the input of a fourth current source circuit arranged in parallel therewith whose output is connected in the manner of a feedback through a pnp-current mirror circuit to a npn-current mirror circuit whose output is coupled to the output of the dynamic control circuit.

REFERENCES:
patent: 3729678 (1973-04-01), Glasbergen et al.
patent: 3868574 (1975-02-01), Ferrieu et al.

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