A Gaas Upconverter Mmic With An Automatic Gain Control Amplifier For 1.9 Ghz Phs

A newly developed GaAs upconverter MMIC with an automatic gain control (AGC) amplifier is presented. The design objectives, considerations, problems, and their solutions are described. The circuit is designed for a 1.9 GHz radiofrequency transceiver for the Japanese Personal Handyphone System applications. The features of the upconverter are: 1) on-chip 50 Ohm impedance matching for all AC input and output signals; 2) a doubly balanced Gilbert cell and a two-stage AGC amplifier with matching circuits that provide 23.0 dB conversion gain, -39 dBc LO suppression, -23 dBc image suppression, and 30 dB gain control; 3) an adjacent channel power of -70 dBc, and 3) a die size of only 2.87 mm(2) (2.52 mm x 1.14 mm).