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A CMOS differential buffer amplifier for ISDN applications is reported. The chip operates from a single 5 V power supply and can deliver a 6 Vpp 80 kHz signal into a load of 100 ohm and/or 300 pF with a THD of about 0.25 %. The circuit main feature is its PSRR which remain practically constant from de to several hundred kHz around - 75 dB for both positive and negative supplies with the common mode...
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