Clocked gain stage having differential inputs and outputs

Details Clocked gain stage having differential inputs and outputs Clocked gain stage having differential inputs and outputs

1985-04-29

1986-03-18

LaRoche, Eugene R.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330261, 330277, H03F 316, H03F 304

Patent

active

045771626

ABSTRACT:
A fully differential gain stage having high gain and common-mode feedback is provided with minimal circuitry. Differential input transistors adapted to receive differential input voltages are coupled to load transistors. During a first time period, the gain stage is placed in unity gain and the load transistors are configured as diodes. Charge storage devices are charged during the first time period with a charge which is proportional to both the current of a current supply and the physical dimensions of the load transistors. During a second time period, the charge storage devices provide a bias voltage to the load transistors which maintains the common-mode output voltage at a predetermined value. During the second time period, the gain stage is configured for high gain operation.

REFERENCES:
patent: 4502019 (1985-02-01), Van Roermund

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