Gain selection technique

Details Gain selection technique Gain selection technique

1995-07-27

1997-04-15

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including gain control means

330134, H03G 320

Patent

active

056213590

ABSTRACT:
An integrated circuit includes a gain control terminal that provides for a choice of discrete gain values for circuitry on the IC. Typically, the gain control terminal is connected to a high voltage source (V.sub.DD), or a low voltage source (V.sub.SS), or optionally left unconnected. In addition, the integrated circuit provides a gain set terminal for connection to an external impedance, typically a resistor, and also includes gain set circuitry for determining the value of the resistor as falling within one range out of several possible ranges. Based upon the range thus determined, the gain set circuitry selects the discrete gain values that are available for choice by the gain control terminal. In this manner, a large range of gain values are available for use even though only a few need to be selected in actual operation of the IC. This technique minimizes external package terminals for the IC, and allows for gain setting by low tolerance resistors.

REFERENCES:
patent: 4924193 (1990-05-01), Saito et al.
patent: 5075633 (1991-12-01), Bowers
patent: 5486791 (1996-01-01), Spitalny et al.
Patent No. EP-A-O 163 409, issued in EPO on 4 Dec. 1985.
Patent No. EP-A-0 095 774, issued in EPO on 7 Dec. 1983 to Miyata, Shinji.
Kadaba R. Laksmikumar et al., "A Baseband Codec for Digital Cellular Telephony", IEEE Journal of Solid- State Circuits, 26 Dec. 1991, No. 12, pp. 1952-1957.

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