a programmable phase locked - loop active filter circuit is provided which includes networks of cooperating bandwidth tuning components to select bandwidth ranges . the values and arrangement of the network of selectable series input resistors are chosen to be useful in both low band and high band settings . likewise , the opamp network of feedback resistors and capacitors values are chosen to be useful in both low band and high band applications , automatically pairing with the r 1 selection in response to a bandwidth range selection . these tuning components , internal to an integrated circuit , can be used for a plurality of wideband loops . external components can be used to supplement the internal components for low and high bandwidth applications .