An Analog High-Order Power Function Generator Circuit for Crystal Oscillator Temperature Compensation
A generation circuit and temperature compensation technology, applied in the direction of electric pulse generator circuit, etc., can solve the problems of unfavorable expansion, higher-order functions are not suitable for wide center temperature offset, etc., and achieve the effect of reducing noise and high calibration accuracy
Active Publication Date: 2016-12-28
TANGSHAN GUOXIN JINGYUAN ELECTRONICS CO LTD
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Problems solved by technology
[0011] Aiming at the fact that the above-mentioned existing n-degree function generation circuit is limited by noise, it is not conducive to expand to higher-order functions to obtain higher order accuracy and the existing function generation circuit is not suitable for wide center temperature excursions, the purpose of the present invention It is to provide an analog high-order power function generation circuit for crystal oscillator temperature compensation
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[0038] see figure 1 and figure 2 , the invention includes a temperature sensor, a power function current generating circuit, a transimpedance amplifier and a voltage adder connected in sequence. The temperature sensor sends the input terminal of the power function current generation circuit by converting the external temperature into a corresponding linear voltage function. The power function current generation circuit converts the information into a corresponding high-order function curve and converts it into a voltage through a transimpedance amplifier, and then adds the first-order function and zero-order calibration function through a voltage adder to obtain the required voltage. The power function current generating circuit includes i+j bipolar limiter differential pairs with emitter negative feedback, wherein i is an integer greater than or equal to 4, and j is an integer greater than or equal to 1. The j differential pairs are used as an additional compensation circu...
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An analog high-order power function generating circuit for temperature compensation of crystal oscillators relates to the technical field of crystal temperature characteristic compensation circuits. The invention comprises a temperature sensor, a power function current generating circuit, a transimpedance amplifier and a voltage adder connected in sequence. The temperature sensor converts the external temperature into a corresponding linear voltage function and sends it to the input terminal of the power function current generation circuit. The power function current generation circuit converts the information into a corresponding high-order function curve and converts it into a voltage through a transimpedance amplifier. The required voltage is added to the first-order function and zero-order calibration function by a voltage adder. The power function current generating circuit includes i+j bipolar limiter differential pairs with emitter negative feedback, wherein i is an integer greater than or equal to 4, and j is an integer greater than or equal to 1. The invention is a high-order power function generating circuit suitable for integration, low noise, and oriented to a wide center temperature offset range, and is very suitable for temperature compensation of crystal oscillators requiring high precision.
Description
technical field [0001] The invention relates to the technical field of crystal temperature characteristic compensation circuits, in particular to a generation circuit of an approximate n-th power function for fitting a high-order n-th power function. Background technique [0002] For AT-cut crystal resonators commonly used in crystal oscillators, the relationship between temperature change and inherent oscillation frequency can be expressed as an approximate cubic function - "Beckmann curve". The extension of the higher order function can make the fitting of this frequency-temperature curve more accurate. Its quintic function expansion can be expressed as the following form. [0003] [0004] where, f is the output frequency, A 5 is the quintic term coefficient, A 4 is the quartic coefficient, A 3 is the cubic coefficient, A 1 is the slope of the first term, and A 0 is the frequency offset. T 0 is the central temperature of the curve, that is, the position of the ...
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IPC IPC(8): H03K3/02
Inventor 吕航王斌田冀楠李妥盛敬刚
Owner TANGSHAN GUOXIN JINGYUAN ELECTRONICS CO LTD