TWO LEVEL REGULATOR SYSTEM FOR VCOS
Original Publication Date: 1992-Aug-01
Included in the Prior Art Database: 2002-Jan-08
Problem to be Solved-Most portable synthesizer designs consist of a dual VCO approach where one VCO functions as the Rx VCO and a 2nd VCO functions as the T% VCO. The purpose of utilizing two VCOs is to increase the operating frequency range of the synthesizer while maintaining a practical resonator design, a realistic Ko due, and good SBN performance. Present synthesizers use the same regulated supply for each VCO as shown: ated at a higher supply voltage than the TX VCO. For example, operation of the Rx VCO at 5.8 VDC instead of 5.0 VDC would result in approximately 2 dB improve- ment in SBN assuming the VCO tank voltage can be increased from 3 Vrms to 3.8 Vrms (ASBN = 20 log 3.813.0 = 2 dB). As a practical note, the Rx VCO SBN requirements are much higher (5-10 dB) than the TX VCO requirements.