Patent ID: 6788145
Filing Date: 2004-09-07
Classification: H03F,H03G

Abstract:
A circuit configuration for producing exponential predistortion for a variable amplifier, comprising:a first controlled current path having a first diode; a second controlled current path having a second diode and connected in parallel with said first controlled current path, controlled currents of said controlled current paths including a common-mode current component for setting an operating point of said first and second diodes and a differential current component for providing a small-signal drive; and a differential amplifier containing a first transistor having a control input connected to said first diode, and a second transistor having a control input connected to said second diode, a ratio of effective transistor areas of said second transistor and said first transistor is equal to a ratio of effective diode areas of said second diode and said first diode, said first diode having a given effective diode area being different from a given effective diode area of said second diode.