Integrated compression amplifier having programmable threshold v

Details Integrated compression amplifier having programmable threshold v Integrated compression amplifier having programmable threshold v

1989-09-25

1991-01-22

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

330254, 330280, H03G 330

Patent

active

049873830

ABSTRACT:
An integrated compression amplifier that can be constructed in CMOS technology and whose threshold voltages are programmable. The compression amplifiers can be built into a multi-channel AGC device, so that the circuit can be co-integrated on a "switched capacitor" filter chip in CMOS technology. The compression amplifier circuit essentially involve a feedback amplifier whose gain is controlled by the output amplitude. To this end, an amplifier SC having variable gain constructed as a "switched capacitor" amplifier, a rectifier unit GR' as well as a low-pass filtr TP' are in a feedback branch and a two quadrant multiplier ZM1 is connected between the input and output Ue', Ua' of the compression amplifier. The output of the lo-pass filter TP' is thereby fed back onto the control input of the two quadrant multiplier ZM'.

REFERENCES:
patent: 3719895 (1973-03-01), Van Der Puije
"Improved Offset-Compensation Schemes for Switched-Capacitor Circuits", by G. C. Temes et al., Electronic Letters, vol. 20, No. 12, Jun. 7, 1984, pp. 508-509.
"Get Gain Control of 80 to 100 dB", W. G. Jung, Electronic Design 13, Jun. 21, 1974, pp. 94-99.
"High Voltage Gain CMOS OTA for Micropower SC-Filters", by F. Krummenacher, Electronic Letters, Feb. 19, 1981, vol. 17, No. 4, pp. 160-162.

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