Stable oscillator without influence of temperature variation and power supply voltage variation

Abstract

The invention provides a comparator for a oscillator circuit with a self bias reference voltage. The comparator includes: a depleted metal oxide semiconductor transistor network which forms constant current equivalent connection, wherein a gate electrode and a source electrode which belong to the depleted metal oxide semiconductor transistor are connected; a enhanced metal oxide semiconductor transistor network, wherein a drain electrode or a source electrode of the enhanced metal oxide semiconductor transistor is connected with the depleted metal oxide semiconductor transistor in series, and a gate electrode terminal can receive a input voltage. The comparator outputs a high level signal when the input voltage is lower than the reference voltage and a low level signal when the input voltage is higher than the reference voltage. Moreover, the oscillator circuit with the comparator ensures that the reference voltage is independent from changes of external voltage source and temperature.

Description

technical field [0001] The invention relates to an oscillator circuit, in particular to an oscillator circuit whose stability is not affected by external power supply and temperature variation. Background technique [0002] Oscillators are commonly used in circuits such as phase-locked loops, frequency synthesizers, and frequency generators. With the popularity of communication and consumer electronics and the need for , has been widely studied by scholars and used in the industry, and its working characteristic is to use the change of the input signal to generate output waveforms of different frequencies. [0003] In other words, the electrical vibration phenomenon that produces repetitive vibrating electrical signals (such as sine waves or square wave signals) is called oscillation. Please refer to FIG. 1, which is a block diagram of a closed loop (close loop) oscillation circuit 100. The oscillation circuit 100 satisfies the Barkhausen Criteria, that is, the loop gain is...

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Problems solved by technology

[0011] It is worth noting that no matter how the oscillator evolves, as long as it uses the charging and discharging effect of the electronic component network (such as a capacitor network and its equivalent network) to generate the output waveform signal, the error caused by the input power cannot be avoided As well as the influence of noise, its frequency characteristics may also change due to changes in temperature

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