Single-ended to differential converter with relaxed common-mode

Details Single-ended to differential converter with relaxed common-mode Single-ended to differential converter with relaxed common-mode

1995-09-29

1997-03-25

Mullins, James B.

Amplifiers

Sum and difference amplifiers

330258, 330260, 330301, H03F 345

Patent

active

056148640

ABSTRACT:
A converter for converting a single-ended input V.sub.IN to a differential output signal V.sub.OUT through positive and negative output terminals is disclosed. The converter comprises a fully differential amplifier with one of its input terminals coupled to the single-ended input and its other input terminal coupled to a fixed voltage. The converter also has a first resistor ("R.sub.1 ") coupled between the single-ended input and the positive input terminal of the fully differential amplifier, a second resistor ("R.sub.2 ") coupled between the fixed voltage and the negative input terminal of the fully differential amplifier, a third resistor ("R.sub.3 ") coupled between the positive input terminal and the negative output terminal of the fully differential amplifier, and a fourth resistor ("R.sub.4 ") coupled between the negative input terminal and the positive output terminal, wherein the values of such resistors are governed by: ##EQU1## The same principles can be applied to differential-to-single-ended converters as well.

REFERENCES:
Frank et al., "Inexpensive Analogue Amplifier For Mechanical Recording", Medical & Biological Engineering & Computing, Jan. 1978, p. 118-120.
Godden, "Amplify Biological Signals With ICs", Electronic Design 17, Aug. 16, 1969, pp. 218-224.

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