LOW-NOISE, LOW-VOLTAGE, LOW-POWER IF GAIN CONTROLLED AMPLIFIERS FOR WIRELESS COMMUNICATION

Circuit solutions of various types of gain controlled IF amplifiers wi th digital and analog gain control are described. Advantages and disad vantages of the different solutions are shown. Requirements for low-po wer, low-voltage, low noise, high gain and linearity at high IF-freque ncies from the system point of view are worked out. Solutions will be presented to optain optimum performance by technology and circuit desi gn technique for digital wireless telephone systems used for GSM and P CN systems.