Patent ID: 6483385
Filing Date: 2002-11-19
Classification: H03F

Abstract:
A signal amplification circuit used in a portable communications device, the signal amplification circuit comprising:an input circuit for supplying input signals; an output circuit for outputting amplified signals; a capacitor comprising a top surface and a plurality of bottom surfaces, a total area of the bottom surfaces being less than a total area of the top surface, the bottom surfaces respectively electrically connected to the input circuit; a plurality of amplification units electrically connected between the top surface and the output circuit; and a bias voltage circuit electrically connected to the top surface for supplying a direct current bias voltage to the amplification units; wherein when an input signal passes into the bottom surfaces of the capacitor through the input circuit, the input signal is coupled with the top surface of the capacitor and passes to the output circuit through the plurality of amplification units to generate an amplified output signal.