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The cross-coupled pairs in CMOS are employed to the voltage controlled oscillator with surface acoustic wave (SAW) resonator. The problem of latch, which is not encounted in conventional LC oscillator, is essential in our case. With a careful design in bias this problem is solved. This oscillator has the advantage of inherent opposite polarity appeared on the terminals of SAW resonator, which leads...
SAW oscillators as stable clock sources are received a number of applications in information and communication industry. As the frequency is raised up several hundred MHz and GHz range, the output with differential waveform such as LVDS has many advantages for power supply noise rejection and direct match to the preceded stages of mixer and phase detector as in the clock and data recovery applications...
The balanced SAW oscillator in the Colpitts configuration is studied. To enhance the start up the cross-coupled pairs are employed. Owing to the insulating feature of SAW resonator, the problem of latch may happen. With a careful design in the aspect ratio of CMOS transistors between main amplifier and cross coupled pair, this problem is solved. By the aid of inherent opposite polarity appeared on...
In this study the clock recovery using high-Q SAW resonator is constructed. With the half rate phase detector, the 622MHz SAW oscillator by CMOS technology is fabricated. With the high speed design and careful layout, the application is for data speed is at 1244MHz. In the future, the phase shift is embedded into the chip to achieve total integration. The linearity of VCSO is desired to improve.
A surface acoustic wave (SAW) resonator based oscillator was developed in response to OC-192 applications. The effects of parasitic capacitance were investigated. This oscillator was fabricated by tsmc 0.18 mum CMOS process. The oscillator's white phase noise floor is -175 dBc/Hz for carrier offset frequency greater than 1 MHz and -136 dBc/Hz at 10 kHz carrier offset. The oscillator provides 4.0 dBm...
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