Title :
A 120 MHz AM/FM PLL-IC with Dual On-Chip Programmable Charge Pump/Filter OP-AMP
Author :
Apetz, U. ; Scheckel, B. ; Weil, G.
Author_Institution :
Siemens AG, Components Division
Abstract :
In the past single chip frequency synthesizer tuning systems have been developed which are suitable for simple radio sets, but bring problems if designed into more sophisticated radios. Separation of the control and display functions from the tuning function allow the PLL circuit to be situated near the tuners and the control and display function near the front of the receiver. This minimises internal radiation as well as the number and length of internal interconnections.
Keywords :
Charge pumps; Circuit optimization; Displays; Filters; Frequency synthesizers; Operational amplifiers; Phase locked loops; Tuned circuits; Tuners; Tuning;
Journal_Title :
Consumer Electronics, IEEE Transactions on
DOI :
10.1109/TCE.1981.273444