Programmable gain instrumentation amplifier

Details Programmable gain instrumentation amplifier Programmable gain instrumentation amplifier

1987-09-24

1989-05-23

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330283, 330300, H03F 345

Patent

active

048334227

ABSTRACT:
A programmable gain instrumentation amplifier includes first and second differential subcircuits, each of which includes first and second input transistors, a first constant current source, first and second gain selection transistors, an output transistor, and a second constant current source. The bases of the first and second input transistors of the first and second subcircuits are connected, respectively, to first and second input terminals. The emitters of the first and second input transistors are connected to first and second gain resistors, respectively, and also are connected to collectors of the first and second gain selection transistors, respectively. The bases of the first and second gain selection transistors of the first and second subcircuits are coupled to first and second gain selection signals, respectively. Collectors of the first and second input transistors are connected to the first constant current source. Emitters of the first and second input transistors are connected to the emitter of the output transistor and to the second constant current source. A bias circuit is connected to the control electrode of the output transistor. An output current flows through the second current carrying electrode of the output transistor. The first and second gain selection signals effectively switch the first and second gain resistors, respectively, in and out of the programmable gain instrumentation amplifier at very high speeds without producing signal glitches.

REFERENCES:
patent: 3940708 (1976-02-01), Sumi et al.
patent: 4341962 (1982-07-01), Buff
patent: 4621238 (1986-11-01), Fenk
"Session XVI: Analog Circuit Techniques" Van de Plassche, 1975, IEEE International Solid-State Circuits Conference, pp. 194-195.
"AMP-O1 Low-Noise Precision Instrumentation Amplifier", Precision Monolithics, Inc., 1/86, Rev. A, p. 6-5.
"Low-Power High Accuracy Instrumentation Amplifier", Burr-Brown Corporation, Mar., 1985, PDS-523.

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