Resistor circuit with temperature coefficient compensation
A temperature coefficient and resistance circuit technology, applied in the direction of resistors with positive temperature coefficients, resistors with negative temperature coefficients, circuits, etc., can solve the problems of no compensation effect, deterioration of compensation effect, etc., and achieve the effect of high-precision resistance
Active Publication Date: 2015-04-29
SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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Problems solved by technology
Due to the different resistor types of the series resistors Rp101 and Rn101, and because the two resistor types are different, the corners of the two resistors do not necessarily change in the same direction, but figure 1 The structure shown only plays a compensation role when the corner changes with the same resistance. On the contrary, when the corner changes, not only does it have no compensation effect, but the compensation effect will deteriorate
[0004] Similar to the resistance circuit with temperature coefficient compensation formed in series, the resistance circuit with temperature coefficient compensation formed in parallel is also because when the types of the two parallel resistances are different, the process angles of the two resistances do not necessarily change in the same direction, but the corner changes instead. Not only does it have no compensation effect, but the compensation effect will deteriorate
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[0026] Such as figure 2 As shown, the embodiment of the present invention has a resistance circuit diagram with temperature coefficient compensation; the resistance circuit with temperature coefficient compensation in the embodiment of the present invention includes: a first series resistance R1 formed by connecting a first resistance Rp1 and a second resistance Rn1 in series; The resistor Rp2 and the fourth resistor Rn2 are connected in series to form a second parallel resistor R2; the first series resistor R1 and the second parallel resistor R2 are connected in series.
[0027] The first resistor Rp1 has a first positive temperature coefficient, the second resistor Rn1 has a first negative temperature coefficient, the first resistor Rp1, the second resistor Rn1, the first positive temperature coefficient and the The magnitude of the first negative temperature coefficient is set to offset the positive and negative temperature coefficients of the first series resistor R1.
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The invention discloses a resistor circuit with temperature coefficient compensation. The resistor circuit comprises a first series resistor and a second parallel resistor, wherein the first series resistor is formed by connecting a first resistor with a second resistor in series; the second parallel resistor is formed by connecting a third resistor with a fourth resistor in series; the first series resistor is connected in series with the second parallel resistor; the first resistor and the second resistor respectively have positive / negative temperature coefficients, and the positive / negative temperature coefficients of the first series resistor are counteracted; the third resistor and the fourth resistor respectively have positive / negative temperature coefficients, and the positive / negative temperature coefficients of the second parallel resistor are counteracted. The first series resistor and the second parallel resistor have the function of secondary temperature coefficient compensation, the resistor circuit remains the temperature coefficient compensation function under any variation combination of process corners, and high-precision resistance can be realized on arbitrary process corners.
Description
technical field [0001] The invention relates to a semiconductor integrated circuit, in particular to a resistance circuit with temperature coefficient compensation. Background technique [0002] In many system-on-chip (SOC) applications, the oscillator is a very important module. Oscillators are divided into RC oscillators, LC oscillators, crystal oscillators, tuning fork oscillators, etc. The RC oscillator realizes the output of the oscillating signal by charging and discharging the capacitor, and the frequency of the oscillating signal can be adjusted by adjusting the value of the resistor or capacitor. Compared with various other types of oscillators, the RC oscillator has the advantages of simple structure and high precision. Therefore, the on-chip RC oscillator (RC silicon oscillator) is widely used in smart card (smart card), microcontroller (Micro Control Unit, MCU) and other products for charge pump (PUMP) drive, logic (LOGIC) clock, etc. [0003] The temperature ...
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IPC IPC(8): H03B5/04
CPCH01C7/006H01C7/02H01C7/04H01C7/06H01C13/02H01C17/232
Inventor 袁志勇
Owner SHANGHAI HUAHONG GRACE SEMICON MFG CORP