Reference voltage generating circuit and reference voltage calibrating method
Active Publication Date: 2015-07-01
SEMICON MFG INT (SHANGHAI) CORP
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[0016] However, the reference voltage generated by the reference voltage generating circuit in the prior art is not adjustable, and the accuracy o
Method used
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Example Embodiment
[0067] Example 1
[0068] Such as image 3 The reference voltage generating circuit 10 shown includes a resistance unit 100, a switch unit 101, and a gate unit (102 to 105). The reference voltage generating circuit 10 of this embodiment only includes one resistance unit 100.
[0069] The resistance unit 100 includes a plurality of resistance elements (R01 to R05) connected in series, and the resistance unit 100 is adapted to output a reference voltage V1 according to the input current I1 and the output resistance. The reference voltage V1 is the product of the output resistance and the input current I1. When the output resistance matches the input current I1, the reference voltage V1 obtained at this time is the matching voltage of the resistance unit.
[0070] The aforementioned input current I1 is composed of a first partial current with a positive temperature coefficient and a second partial current with a negative temperature coefficient. It can be considered that the input curr...
Example Embodiment
[0089] Example 2
[0090] This embodiment is based on embodiment 1, and provides a method such as Figure 4 The reference voltage generating circuit 20 shown is different from Embodiment 1 in:
[0091] The switching element is realized by a switching transistor;
[0092] The reference voltage generating circuit 20 further includes a current unit 106 adapted to provide the input current I1. reference Figure 4 , The current unit 106 includes: a current mirror unit 61, an operational amplifier unit 62, a first resistor 63, a second resistor 64, a third resistor 65, a first bipolar transistor T1 and a second bipolar transistor T2;
[0093] The current mirror unit 61 includes a first node 610, a second node 611, a first PMOS tube P1, a second PMOS tube P2, and a third PMOS tube P3. The first PMOS tube P1, the second PMOS tube P2, and the third PMOS tube The gate of the tube P3 is connected to the first node 610, the source is connected to the second node 611, the second node 611 is conne...
Example Embodiment
[0109] Example 3
[0110] This embodiment provides a method such as Figure 5 The reference voltage generating circuit 30 shown is based on the reference voltage generating circuit described in Embodiment 1, and further includes the current unit 106 described in Embodiment 2.
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Abstract
The invention provides a reference voltage generating circuit and a reference voltage calibrating method. The reference voltage generating circuit comprises at least one resistor unit, switching unit and gating unit; each resistor unit comprises a plurality of resistor elements connected in series, suitable for providing the resistor unit with matching voltage according to input current and output resistance of the resistor elements; each switching unit comprises switching elements; the switching elements and the corresponding resistor elements are connected in parallel, forming a switch array; when the switching elements are closed, the corresponding resistor elements are short-connected and output the output resistance of the corresponding resistor units; the gating units corresponds to the switching elements and are suitable for being gated according to input siting signals; the siting signals are related to address information of the switching elements of the switch array; the switching elements are suitable for changing in the initial state when the corresponding gating units are gated. The reference voltage generating circuit has the advantages that output voltage of the resistor units is adjustable and provided reference voltage is more accurate.
Description
technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a reference voltage generation circuit and a reference voltage calibration method. Background technique [0002] The reference voltage is an essential parameter in the field of integrated circuits, and it is extremely important whether the reference voltage generation circuit can provide an accurate reference voltage. [0003] Typically, mechanisms in the field of integrated circuits utilize voltage reference systems such as figure 1 shown, including: [0004] Reference voltage generation circuit 1, which is a bandgap reference source, is suitable for generating at least one basic reference voltage vr which is not sensitive to power supply voltage, production process and operating temperature; [0005] A low-pass filter circuit 2, suitable for filtering the reference voltage; [0006] A voltage-current conversion circuit 3, adapted to output the device current It a...
Claims
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