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diff b/w transconductance and transimpedence amp

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Chethan

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Hi all,
can someone tell me the difference between transconductance amplifier and transimpedence amplifier. Any materials regarding the same would be very helpful.

regards
chethan
 

Transconductance amplifier:

The input signal is a voltage, the output signal is a current.
Transconductance amps usually have high input resistance, and high output resistance.

Transimpedance amplifier (also called Transresistance amplifier):

The input signal is a current, the output signal is a voltage. Transimpedance amps usually have low input resistance and low output resistance.
 

    C

    Chethan

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rtarbell said:
Transconductance amplifier:

The input signal is a voltage, the output signal is a current.
Transconductance amps usually have high input resistance, and high output resistance.

Transimpedance amplifier (also called Transresistance amplifier):

The input signal is a current, the output signal is a voltage. Transimpedance amps usually have low input resistance and low output resistance.
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Hi rtarbell,

Thanx for the reply. But you said that transconductance amplifier have current as output. Then are you sure that the output resistance should be high.

thanx in advance
chethan
 

Current source has high output resistance , ideally infinite.
 

the idea is that u want the output to be completely transfered to the load so if the output is current then the lower resistance take it all, hence the o/p resistance should be large no to take current .
the same applies for the transimpedence as the o/p is voltage then the large resistance takes most of the o/p voltage and hence we want smallest o/p resistance.
regards,
a.safwat
 

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