Clock signal generating circuit

Abstract

The invention provides a clock signal generating circuit which comprises a crystal oscillation unit and a clock shaping unit, wherein the crystal oscillation unit generates an initial clock signal, and the clock shaping unit is used for shaping the initial clock signal and then outputting a standard clock signal. The clock signal generating circuit also comprises a current bias unit connected with the crystal oscillation unit and the clock shaping unit, wherein the crystal oscillation unit and the clock shaping unit mirror the bias current of the current bias unit, and the mirror current is used as a working current, so that the currents of the crystal oscillation unit and the clock shaping unit can be controlled and regulated by controlling the current of the current bias unit.

Description

【Technical field】 [0001] The invention relates to the field of electronic circuits, in particular to a clock signal generation circuit with improved power consumption. 【Background technique】 [0002] In the field of microelectronics, especially in various electronic chips, it is often necessary to use standard clock signals of square wave waveforms with amplitudes of 0 and 1 as control signals for other circuits. In order to provide this standard clock signal, it is usually necessary to design a clock signal generating circuit. Such as figure 1 As shown, it shows the clock generation circuit of the commonly used CMOS chip at present, which includes a crystal oscillation unit composed of an external crystal U3, load capacitors CL1, CL2, and an internal crystal oscillator, and a clock shaping circuit. [0003] The external crystal U3 and the two load capacitors CL1 and CL2 are connected in series, and the connected ends of the two capacitors CL1 and CL2 are grounded. The tw...

AI Technical Summary

Problems solved by technology

[0005] However, in the existing clock signal generating circuit, since the original clock signal output by the crystal oscillator unit is directly shaped by the inverter of the clock shaping circuit, the current of the crystal oscillator unit and the clock shaping circuit cannot be controlled, and the entire clock signal generating circuit The power consumption is relatively large, and it will also increase the power consumption of the chip for the entire chip

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