| 摘要 |
<p>A gain controlled amplifier comprising a first means (60) for providing a first current (i1 +) and a second curent (i1-) corresponding to an input signal (Vin), a second means (20, 50) for providing a first attenuated current (i22) corresponding to the first current (i1 +), a third means (30) for providing a second attenuated current (i31) corresponding to the second current (i1-), a fourth means (70) for providing a control signal (Vc) for changing magnitude of the first and second attenuated currents (i22, i31), and a fifth means (R2, A2)for providing an output signal (Vout) corresponding to amplitudes of the first and second attenuator currents (i22, i31). The first means comprises a split current generator (R3, A3, Q61-Q63) for separately providing the first current (i1 +) corresponding to the positive component of the input signal (Vin) and the second current (i1-) corresponding to the negative component of</p> |
