Apparatus for establishing the differences between multiple pair

Details Apparatus for establishing the differences between multiple pair Apparatus for establishing the differences between multiple pair

1985-11-19

1987-07-28

Mullins, James B.

Amplifiers

Sum and difference amplifiers

128696, 128902, 330 84, 330107, 330124R, 330147, 330148, H03F 345

Patent

active

046834419

ABSTRACT:
A bank of differential amplifier circuits includes specialized circuits to provide multi-channel differencing with a minimum number of active devices such that the differences between pairs of analog input signals, such as available from patient monitoring electrodes, are derived with half the number of active devices normally utilized. In one embodiment, two operational amplifier circuits are used in a differencing channel which functions together to provide differencing, a properly delayed input signal for use in another differencing channel, high input impedance buffering, a low impedance output for each differential amplifier channel, time-coincident, matched outputs for each differential amplifier channel, and with an additional operational amplifier, a DC rejection circuit which does not affect the low output impedance or the differencing function, thereby to eliminate the necessity of providing separate buffers and active delay circuits which can result in the use of twice the number of active devices. The above results are accomplished through the use of a predetermined ratio for the input and feedback resistors associated with the pairs of operational amplifiers in each channel and by tapping off a signal in one channel for use as an input signal in another channel.

REFERENCES:
patent: 4152659 (1979-05-01), Gordon
patent: 4480229 (1984-10-01), Van Kessel et al.
Hadley, "Isolation Amplifier", Wireless World, vol. 87, No. 1545, Jun. 1981, p. 67.

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