Title :
Design of the voltage clamp delay cell VCO using quadrature phase for low phase noise and high speed operation
Author :
Seo, I.W. ; Choi, W.B. ; Jung, S.M. ; Sung, Y.
Author_Institution :
Dept. of Electr. Eng., Korea Univ., Seoul, South Korea
fDate :
6/21/1905 12:00:00 AM
Abstract :
We have designed a new current-mode low-voltage, low-power supply, high-frequency CMOS VCO (Voltage Controlled Oscillator) circuit. The main purpose of this new circuit is to obtain low phase noise with more than 1 GHz oscillation frequency from one battery cell. The fully differential-type voltage clamp delay cell VCO enables extremely low supply voltage operation due to wide tuning range and superior linearity between the oscillator frequency and control voltage of a ring oscillator because of low phase noise. A design which combines the transitions of each delay cell output enables the VCO´s high frequency operation. The characteristics of the designed VCO were examined by the HSPICE and SABER circuit simulation. Operation with a 3.3 power supply and 3.6 GHz oscillation frequency was verified
Keywords :
CMOS analogue integrated circuits; SPICE; current-mode circuits; delay circuits; high-speed integrated circuits; integrated circuit design; low-power electronics; phase noise; voltage-controlled oscillators; 3.3 V; 3.6 GHz; HSPICE; SABER; circuit simulation; current-mode low-voltage high-frequency CMOS VCO; design; fully differential voltage clamp delay cell; high-speed operation; linearity; phase noise; quadrature phase; ring oscillator; tuning range; voltage controlled oscillator; Batteries; Circuits; Clamps; Current supplies; Delay; Frequency; Phase noise; Ring oscillators; Voltage; Voltage-controlled oscillators;
Conference_Titel :
VLSI and CAD, 1999. ICVC '99. 6th International Conference on
Conference_Location :
Seoul
Print_ISBN :
0-7803-5727-2
DOI :
10.1109/ICVC.1999.821003
