REMOTE MICROPHONE IN

PERSONAL COMPUTERS

Remote microphones in Personal Computers often utilize a

microphone at the top of the monitor which must drive a long

cable in a high noise environment. One method often used to

reduce the nose is to lower the signal impedance, which re-

duces the noise pickup. In this configuration, the amplifier

usually requires 30 db–40 db of gain, at bandwidths higher

than most low-power CMOS parts can achieve. The LM7301

offers the tiny package, higher bandwidths, and greater out-

put drive capability than other rail-to-rail input/output parts

can provide for this application.

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