Broadband DC level shift circuit with feedback

Details Broadband DC level shift circuit with feedback Broadband DC level shift circuit with feedback

1986-10-14

1988-02-16

Wan, Gene

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330261, H03F 345

Patent

active

047257903

ABSTRACT:
A DC level shift circuit includes a differential amplifier with a level shift stage. The level shift stage has two portions for transmitting the input signals forming the differential signal through the level shift stage. A current source transmits the input signals through the level shift stage. Transistors with impedances substantially equal to the current source impedances are cross coupled to each input terminal. Each transistor senses a distortion signal produced by the current source impedance at one terminal and produces in response a correction signal. The correction signal is then transmitted to the other input terminal to be summed with the distortion signal there to pass the input signals through the level shift stage without distortion. The DC level shift stage is also responsive to another correction signal generated by a feedback control stage to control the common mode voltage of the amplifier.

REFERENCES:
patent: 4551642 (1965-11-01), Aizawa et al.

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