Conference Proceeding

A wideband dual-mode VCO with analog and digital automatic amplitude control circuitry

06/2011; pp.1 - 6 In proceeding of: Electrical Engineering (ICEE), 2011 19th Iranian Conference on
Source: IEEE Xplore

ABSTRACT In this paper, a dual mode class-C LC voltage controlled oscillator (VCO) has been designed in a 0.18 μm CMOS process. This system is capable to oscillate at two different frequencies, achieving a quite wide 64% tuning range. Depending on the oscillation frequency, the VCO current consumption is automatically adjusted from 4–5.5 mA using a 0.9 V power supply. The phase noise at 1 MHz offset from the carrier frequencies of 2 and 3 GHz are also −125 and −122 dBc/Hz, respectively. A design formula for the tuning range is proposed which considers the ratio of frequency overlap (OL) and all the parasitic effects from band-switching capacitor array and transistors. Furthermore, in order to stabilize the performance through the mentioned tuning range, both analog and digital automatic amplitude control techniques are presented. These amplitude control schemes consume a negligible power and area without degrading the phase noise.

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Keywords

1 MHz
 
3 GHz
 
amplitude control schemes
 
band-switching capacitor array
 
carrier frequencies
 
different frequencies
 
digital automatic amplitude control techniques
 
dual mode class-C LC voltage
 
frequency overlap
 
mentioned tuning range
 
oscillator
 
parasitic effects
 
phase noise
 
VCO current consumption
 
wide 64% tuning range
 
μm CMOS process