Transconductance amplifier having sensfets which drive a load with linearly proportional current
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United States of America Patent
Stats
-
Mar 2, 1993
Grant Date -
N/A
app pub date -
Jul 25, 1991
filing date -
Jul 25, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A transconductance amplifier has sensfets connected to an H bridge configuration to drive a load with current which is linearly proportional to the input signal. A inverting or a non-inverting side is active depending upon whether the signal is above or below a reference. Three stages include power amplifiers, switches and comparators for turning the two sides on and off. A mirror current source for each sensfet provides feedback to maintain the linearity of the load current as a function of input signal, thus eliminating the need for a resistor in the current path for sensing the feedback.
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