Dual Mode Digitally Temperature Compensated Crystal Oscillator

摘要: Abstract : This paper describes a method of utilizing low frequency mode vibration an AT cut resonator to temperature compensate second accuracy + or - 2 pp 10 the 7th power over range 0 degrees C 70 C. In DMDTCXO (Dual Mode Digitally Temperature Compensated Crystal) two loop oscillating scheme was developed allow 3.0 MHz vibrate in modes oscillation, approximately half time each, as shown Figure 1. The 810 kHz used digitized eight bit address, and correction word resonator. contains that oscillates continuously. For one-half is phase-locked first During remaining cycle, output held at its previous value present continuous from system. If does not change too much before closed again, then system can remain steady state locked condition.