K. Ohhata et al., Design of a 32.7-GHz bandwidth AGC amplifier IC with wide dynamic range implemented in SiGeHBT, IEEE J SOLI, 34(9), 1999, pp. 1290-1297
A wide-bandwidth automatic gain control (AGC) amplifier IC was developed us
ing a self-aligned selective-epitaxial Sice heterojunction bipolar transist
or (HBT). A transimpedance load circuit was used, and its damping factor wa
s optimized to achieve a a ide bandwidth of 32.7 GHz, Capacitor peaking was
introduced to the second variable-gain amplifier in order to obtain a wide
gain dynamic range of 19 dB, The amplifier IC has a noise figure of 18 dB
and an eye pattern at 25 Gb/s.