A 250-MHz Monolithic Voltage-Controlled 0 scillat or with Low Temp er a ture

A bstruct -A monolithic voltage-controlled oscillator (VCO) with dualloop feedback has been designed and fabricated in a 2-pm oxide-isolated bipolar technology. The VCO, consuming 220 mW from a single 5-V supply and occupying 2200 mils', achieves a -65 ppm/"C temperature coefficient (TC) of frequency. It has a 5:l frequency control range, and the maximum oscillation frequency is 250 MHz with better than a 2% voltage-to-frequency linearity. The modulation bandwidth of the VCO is emitter-coupled oscillator, it can also be applied to other techolo@es oscillator configurations where precision, linearity, and temperature stability of frequency are required.