Differential receive booster amplifier for telephone instruments

Details Differential receive booster amplifier for telephone instruments Differential receive booster amplifier for telephone instruments

1985-09-23

1988-01-05

Ng, Jin F.

Telephonic communications

Substation or terminal circuitry

Sidetone control or hybrid circuit

379395, H04M 158

Patent

active

047180838

ABSTRACT:
An amplifier having properties of natural side tone balancing based on the utilization of a bridge arrangement, high efficiency with resulting high gain, high AC impedance and compatibility with electret microphones and electret microphone amplifiers. A matched pair of differential transistors arranged as part of a bridge circuit form a detector of the receive signal at one input versus a transmit signal which appears at both inputs in the same phase and therefore is rejected as a common mode signal. The resultant balancing of side tone and high gain finds particular application in telephone networks where the characteristics dictate the need for higher than usual receive gain or for use by auditorially handicapped users over a normal telephone network.

REFERENCES:
patent: 3529099 (1970-09-01), Ribner
patent: 3909559 (1975-09-01), Taylor
patent: 3974344 (1976-08-01), Mersich
patent: 4031331 (1977-06-01), Sencer
patent: 4163878 (1979-08-01), Hashemi
Signetics Digital Linear MOS, Signetics Corporation Integrated Circuit Catalog, 1972, pp. 6-7 to 6-11.
Analysis and Design of Analog Integrated Circuits, Paul Gray et al., John Wiley and Sons, New York, 1977, pp. 332-341.

Affiliated with

Also associated with

Rating

Differential receive booster amplifier for telephone instruments does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Differential receive booster amplifier for telephone instruments, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Differential receive booster amplifier for telephone instruments will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-12568