Operational transconductance amplifier and AGC amplifier using the same
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United States of America Patent
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Jan 3, 2006
Grant Date -
Dec 4, 2003
app pub date -
May 22, 2003
filing date -
May 28, 2002
priority date (Note) -
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Abstract
In an operational transconductance amplifier (OTA), resistors are bridge-connected to source terminals of MOSFETs that form a differential pair of the OTA. Capacitors are connected in parallel between the resistors in order to remove a DC signal component. The C-R circuit forms a high pass filter in order to intercept the DC component. Accordingly, even if there is a difference in transistor characteristic between the MOSFETs, a DC offset voltage does not appear in differential output terminals of the OTA and an output error can be eliminated. When the OTA is used in an AGC amplifier, an output dynamic range of the AGC amplifier can be made wide owing to the removal of the DC offset voltage.
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