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Design of a CMOS Sawtooth-Wave Oscillator Circuit
. x$ y5 _, k; b$ n& y& h- IMA Tian-hua , J IANGGuo-ping ,WANG Li
4 g$ o5 z* v9 \, \: ~% [(School of Electronic Engineer ing , Dalian University of Technology ,Dalian Liaoning 1 1 60 2 3 , China)
. G R6 T- t: q3 _0 AAbstract :A Sawtooth - Wave Oscillator Circuit based on 1 .2 μm CMOS technology is designed .On
* G$ t: u9 m, H/ }: j/ x) s- Lbeing designed ,comparator is regarded as a key circuit ,meanwhile , the method of constant current! ], l S% {: x# c! Z4 b
source charging and discharging is used . Of course , the design of each component circuit is also explained
6 q+ a% L5 ~3 e+ ~8 S$ l- o.The oscillator circuit is emulated by using the tool of Cadence SpectreS .It shows that the oscillating
8 X) b. p& A5 F6 Tfrequency has a good characteristic of linearity .When the power voltage is 5 .0 V or so, the
2 W7 }, e$ ?' d7 j! tfrequency is stable ,so does it from 27℃ to 55℃ .Because of the better performances with the change
0 D& Y) G' P+ G- Wof appropriate supply voltage and temperature , this Oscillator Circuit can be widely used in many, F+ b, x8 _5 v5 f5 E1 j
kinds of electronic circuits .
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