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M377: Difference between revisions
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* [[165-2089-06]] | * [[165-2089-06]] | ||
* [[155-2089-05]] (11A33) | * [[155-2089-05]] (11A33) | ||
The M377 has one input (differential) and three differential outputs which are identical circuits. | |||
Each output has a its own control pins for: | |||
* Output invert | |||
* Output enable | |||
* High-frequency adjustment. The HF ADJ pins have 2k ohms input resistance to ground. The nominally acceptable inputs are ±1V to ground. Because the input resistance tracks the nichrome standard resistors inside the chip, the input is actually current sensitive, not that it makes much difference. This current affects the standing current in a feedback amplifier and hence its open loop gain. At low frequencies, the gain of the M377 is determined entirely by resistor values. At high frequencies, there is phase shift and changing the open loop gain will also change the closed loop gain, hence the transient response. | |||
This means that the gain of the closed loop and hence the hf gain of the amplifier varies with the current in the HF ADJ input. | |||
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