Bandgap Voltage Generation Circuit
A voltage generation circuit and circuit technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve problems such as accuracy effects, and achieve the effect of improving accuracy and small chip area
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0038] figure 2 The circuit diagram of the bandgap voltage generation circuit provided for Embodiment 1 of the present invention, such as figure 2 As shown, the bandgap voltage generating circuit includes: a first switch control signal, a second switch control signal, a bias circuit 201, a first transistor 202, a voltage sampling circuit 203, and a second transistor 204;
[0039] The bias circuit 201 is connected to the power supply, and is used to provide a first bias current for the first transistor and a second bias current for the second transistor 204, so that the first transistor 202 and the second transistor 204 work in a linear range ;exist figure 2 In , the power supply is omitted, and VIN represents the output voltage of the power supply;
[0040] The emitter of the first transistor 202 is connected to the bias circuit 201 at a first node, so that the bias circuit 201 provides a first bias current for the first transistor 202;
[0041] The emitter of the second...
Embodiment 2
[0057] image 3 The circuit diagram of the bandgap voltage generating circuit provided for Embodiment 2 of the present invention, as image 3 shown, in this example, and figure 2 In comparison, the third resistor R3 and the fourth resistor R4 are added.
[0058] The third resistor R3 and the fourth resistor R4 are connected in series, one end of the third resistor R3 is connected to the second node, and one end of the fourth resistor R4 is in phase with the base and collector of the second bipolar transistor Q2 and the third sampling capacitor C3 connect.
[0059] When the resistance values of the first resistor R1 and the second resistor R2 are small, the first resistor R1 and the second resistor R2 will shunt the current of the current source I1, causing the current of the first bipolar transistor Q1 to be affected by the change of the resistance value, so The third resistor R3 and the fourth resistor R4 provide current compensation for the first bipolar transistor Q1 ...
Embodiment 3
[0062] Figure 4 The circuit diagram of the bandgap voltage generating circuit provided for Embodiment 3 of the present invention, as Figure 4 shown in Figure 4 In, the connection relationship between the bias circuit 201 and the first transistor 202 and the second transistor 204 and figure 2 same.
[0063] The first transistor 202 is specifically a first bipolar transistor Q1, and the second transistor 204 is specifically a second bipolar transistor Q2.
[0064] The first current source I1 provides the first bias current for the first bipolar transistor Q1, so that the first bipolar transistor Q1 works in a linear range. At this time, the first node voltage V1 is generated, and the second current source I2 is the second The bipolar transistor Q2 provides a second bias current to make the second bipolar transistor Q2 work in a linear range, and at this time, a second node voltage V2 is generated.
[0065] The voltage sampling circuit 203 includes a first switch K1, a se...
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More