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Low power consumption and rapid oscillation starting crystal oscillator module with programmable adjusting start-oscillation condition

A technology for crystal oscillators and start-up conditions, which is applied in the field of communication electronic integrated circuits and crystal oscillators, and can solve the problems of not using automatic gain control loops, large power consumption, and not proposing the best technical solution for low power consumption. , to achieve the effect of solving process and temperature dependence, low power consumption, and improving phase noise

Inactive Publication Date: 2011-04-06
杭州中科微电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Wang Yue and others published the article "Design of 32.768KHz crystal oscillator circuit for RTC" in the Journal of Nankai University (Natural Science Edition), 2007. The paper analyzed the start-up conditions of the crystal oscillator, but did not propose to solve the problem of low power consumption. The best technical solution, no automatic gain control loop is used, so the power consumption is still relatively large

Method used

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  • Low power consumption and rapid oscillation starting crystal oscillator module with programmable adjusting start-oscillation condition
  • Low power consumption and rapid oscillation starting crystal oscillator module with programmable adjusting start-oscillation condition
  • Low power consumption and rapid oscillation starting crystal oscillator module with programmable adjusting start-oscillation condition

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Embodiment 1

[0045] figure 2 It is a circuit block diagram of a crystal oscillator with low power consumption and fast start-up, which can be programmed to adjust the start-up conditions of the embodiment of the present invention. The XIN and XOUT pins are respectively connected to the load capacitors C1 and C2 of the crystal oscillator, and the 32.768KHz crystal oscillator XTAL is connected between the XIN and XOUT pins. 111 is an automatic gain control loop AGC with a π-type filter inside, the output end of AGC is connected to the bias end of INV1 inverting amplifier 112, the output end of INV1 inverting amplifier 112 is connected in series with the input end of INV2 inverting amplifier chain 113, Also connect one end of R1 feedback resistor 114 and R2 power current limiting resistor 115 at the series connection end, the other end of R1 feedback resistor connects the input end of AGC, the input end of INV1 inverting amplifier 112 and the XIN input end 116 of OSC monolithic 11, The XOUT...

Embodiment 2

[0057] Figure 6The overall circuit diagram of the crystal oscillator module of the embodiment of the present invention is given. The two transconductance amplifiers used as large resistances of this low-power, fast-starting crystal oscillator module that can be programmed to adjust the starting conditions share a self-bias Set the micro current source to provide bias voltage. The automatic gain control loop AGC includes an automatic gain control amplifier composed of C4, PM6, NM5, NM6 and resistor R3, and a π-type filter composed of resistor R2_E, capacitor C0 and C5. The VB3 bias is connected to the gate of the automatic gain control amplifier PM6, and the crystal oscillator signal from the XIN terminal is coupled to the gate of PM6 through the DC blocking capacitor C4 to provide the detected crystal oscillator signal for the input terminal of the AGC loop. The drain of the automatic gain control amplifier PM6 is connected to the input terminal Vi of the π-type filter, and ...

Embodiment 3

[0062] The two transconductance amplifiers of the crystal oscillator module in Embodiment 3 of the present invention use a programmable and adjustable self-bias micro-current source to provide the bias voltage VB2 respectively, see Figure 7a . Two independent self-biased micro-current sources are used to provide bias for the two transconductance amplifiers respectively, and R1-E and R2-E are independently programmed and controlled to realize precise control of the resistance values ​​of R1-E and R2-E.

[0063] As a preference, Figure 7b An electrical block diagram of a self-biased micro-current source shared by two micro-current source transconductance amplifiers in Embodiment 2 of the present invention is given. The two micro-current source transconductance amplifiers R1_E and R2_E share a programmable and adjustable micro-current source 73 to realize uniform programming control of the resistance values ​​of R1-E and R2-E. Compared with Embodiment 3 of the present inventi...

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Abstract

The invention discloses a low power consumption and rapid oscillation starting crystal oscillator module with a transposable start oscillation condition, which consists of an inverting amplifier, an inverting reshaper chain, an automatic gain control loop (AGC), a feedback resistor, a power limitation resistor, and an external passive crystal oscillator and an external load capacitor. The inverting amplifier is provided with a transposable feedback resistor R1, and the transposable start oscillation condition of the crystal oscillator is realized; and the automatic gain control loop (AGC) is inserted between an input end and a bias end of the inverting amplifier, and the contradiction between the oscillation starting time and power consumption is solved. The invention also provides a highresistor realizing IC (integrated circuit) by adopting a transconductance amplifier of micro current source, and a transposable feedback resistor R1 for the oscillator amplifier branch circuit and a high resistor in a pi-shaped filter. The resistance value of the high resistance can be controlled by programming, the start oscillation condition of the oscillator can be adjusted through adjusting the feedback resistance R1, and reliable and quick start oscillation of the oscillator can be realized; and lower phase noise can be realized through adjusting the high resistor in the pi-shaped filter. The crystal oscillator circuit has the characteristics of low power consumption and rapid start oscillation, and can be used for the digital integrated circuit, such as a base band of various of satellite navigation allocation receptors, real time clocks (RTC).

Description

technical field [0001] The invention belongs to the communication electronic integrated circuit technology, and relates to a crystal oscillator, in particular to a low power consumption and fast start-up crystal oscillator circuit which can be programmed to adjust the start-up condition. Background technique [0002] With the development of portable mobile devices, low power consumption and low cost have become an urgent requirement for integrated circuit design. In particular, the design of battery-powered timers in portable devices requires crystal oscillator circuits with low power consumption and low cost. For a general 32.768KHz crystal oscillator circuit, a lithium battery usually requires 2 to 3 years of work, or even 6 years. This puts a strict limit on the power consumption of the crystal oscillator circuit, and the expected value of its operating current is less than 1μA. [0003] However, the condition for fast start-up of the crystal oscillator is that a large ...

Claims

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Application Information

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IPC IPC(8): H03L3/00
Inventor 武振宇庄海孝马成炎
Owner 杭州中科微电子有限公司
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