Patent ID: 6246351
Filing Date: 2001-06-12
Classification: H03M

Abstract:
An interpolation circuit for digitally interpolating between a first voltage on a first conductor and a second voltage on a second conductor, comprising:(a) a plurality of voltage-to-current converter circuits each including a non-inverting input, an inverting input, and a current source establishing a bias current in the voltage-to-current converter;(b) an amplifier coupled to produce an output voltage in response to the sum of a plurality of currents produced by the plurality of voltage-to-current converter circuits, the output voltage being coupled to the inverting input of each of the voltage-to-current converter circuits, the current produced by each voltage-to-current converter being related to the bias current in that voltage-to-current converter; and(c) a switching circuit adapted to selectively couple the non-inverting inputs of corresponding voltage-to-current converter circuits to one or the other of the first and second conductors in response to a plurality of digital bit signals, respectively.