TWI599179B - Electronic device and input voltage compensation method - Google Patents

Description

Electronic device and input voltage compensation method

The present invention relates to an electronic device, and more particularly to an electronic device having an input voltage compensation function and an input voltage compensation method.

When the electronic device is disposed on a circuit board (such as a PCB), a circuit pin of the electronic device is coupled to the output end of the voltage regulator to receive the output voltage provided by the voltage regulator. For an electronic device made of an integrated circuit (IC), when the system is started, the circuit pin of the electronic device receives the output voltage provided by the voltage regulator. However, in conventional implementations, the output of the voltage regulator is coupled to its feedback terminal to regulate the output voltage. Therefore, the trace path on the circuit substrate and the parasitic impedance generated by the internal wire bonding of the electronic device will cause an IR drop phenomenon, which is likely to cause the power supply voltage received inside the electronic device to be much lower than that of the voltage regulator. The output voltage makes the electronic device not working properly.

Therefore, in order to ensure the normal operation of the electronic device (IC), the output voltage provided by the voltage regulator is often increased, thereby offsetting the influence of voltage decay. However, in the case of an electronic device operating in a low-performance mode, excessive power supply voltage can cause additional static power loss. In view of this, how to effectively offset the influence of voltage decay and reduce the static power loss of the electronic device in the low-efficiency mode is an urgent problem to be solved in the field.

The present invention provides an electronic device including a first circuit pin, a second circuit pin, and a processing circuit. The first circuit pin is coupled to the output of the voltage regulator and is configured to receive the first power voltage provided by the output of the voltage regulator such that the first circuit pin has a second power voltage. The second circuit pin is coupled to the feedback end of the voltage regulator. The processing circuit is coupled to the first circuit pin and the second circuit pin, and configured to generate a feedback voltage to the second circuit pin according to the second power voltage of the first circuit pin, so that the voltage regulator is based on the feedback voltage Adjust the first supply voltage.

The present invention further provides an electronic device including a voltage regulator having an output end and a feedback end, and an internal circuit having a first connection pad, a second connection pad, and a processing circuit. The first connection pad is coupled to the output end of the voltage regulator and configured to receive the first power supply voltage provided by the output of the voltage regulator such that the first connection pad has a second power supply voltage. The second connection pad is coupled to the feedback end of the voltage regulator. The processing circuit is coupled to the first connection pad and the second connection pad, and configured to generate a feedback voltage to the second connection pad according to the second power supply voltage of the first connection pad, so that the voltage regulator adjusts according to the feedback voltage A power supply voltage.

The present invention further provides an input voltage compensation method, which is implemented in an electronic device. The electronic device includes a first circuit pin, a second circuit pin, and a processing circuit, wherein the first circuit pin is coupled to the processing circuit and an output of the voltage regulator, and the second circuit pin is coupled to the processing The circuit and the feedback terminal of this voltage regulator. The input voltage compensation method includes the following steps. First, the first power supply voltage is received from the output of the voltage regulator by using the first circuit pin such that the first circuit pin has a second power supply voltage. Then, the processing circuit is used to generate a feedback voltage to the second circuit pin according to the second power voltage of the first circuit pin, and cause the voltage regulator to adjust the first power voltage according to the feedback voltage.

In summary, the electronic device and the input voltage compensation method provided by the present invention can be coupled to the feedback terminal of the voltage regulator by additionally adding circuit pins on the same chip, thereby offsetting the influence of voltage decay, and Reduce the electronic device in low performance mode Loss of power consumption.

1, 1'‧‧‧ electronic devices

110, 120‧‧‧ circuit pins

130‧‧‧Processing Circuit

20, 20'‧‧‧Voltage regulator

210‧‧‧ Output

220‧‧‧reporting end

VDD1, VDD2‧‧‧ power supply voltage

VF‧‧‧ feedback voltage

Z1, Z2, Z3‧‧‧ parasitic impedance

R1, R2, R3, R4, Ra_1~Ra_N, Rb_1~Rb_M‧‧‧ resistance

C1, C2, C3, C4‧‧‧ capacitors

L1, L2, L4‧‧‧ inductance

I1‧‧‧Load current

GND‧‧‧ Grounding voltage

10‧‧‧Internal circuits

110’, 120’‧‧‧ connection pads

131‧‧‧ processor

133‧‧‧Compensation circuit

TS‧‧‧ control signal

TS1, TS2‧‧‧ switch control signals

1331, 1333‧‧‧ resistance array

SW1_1~SW1_N, SW2_1~SW2_M‧‧‧ Switching Circuit

S501~S503‧‧‧ Process steps

1 is a circuit diagram of an electronic device according to an embodiment of the present disclosure.

FIG. 2 is a schematic circuit diagram of an electronic device according to another embodiment of the present disclosure.

FIG. 3 is a schematic diagram of a processing circuit in an electronic device according to an embodiment of the present disclosure.

4 is a circuit diagram of a compensation circuit in the processing circuit of FIG.

FIG. 5 is a flow chart of an input voltage compensation method according to an embodiment of the present disclosure.

In the following, the invention will be described by way of illustration of various embodiments of the invention. However, the inventive concept may be embodied in many different forms and should not be construed as being limited to the illustrative embodiments set forth herein. In addition, the same reference numerals may be used in the drawings.

Referring to FIG. 1, FIG. 1 is a schematic circuit diagram of an electronic device according to an embodiment of the present disclosure. The electronic device 1 includes a circuit pin 110, a circuit pin 120, and a processing circuit 130. In the present embodiment, the electronic device 1 can be made, for example, by an integrated circuit (IC). In some embodiments, the electronic device 1 of FIG. 1 can be regarded as a system on chip (SoC).

The circuit pin 110 is coupled to the output 210 of the voltage regulator 20 and is configured to receive the power supply voltage VDD1 provided by the output 210 of the voltage regulator 20 such that the circuit pin 110 has a power supply voltage VDD2. The circuit pin 120 is coupled to the feedback terminal 220 of the voltage regulator 20 .

The processing circuit 130 is coupled to the circuit pins 110 and 120 and configured to generate the feedback voltage VF according to the power supply voltage VDD2 of the circuit pin 110 to the circuit pin 120, so that the voltage regulator 20 can adjust the power supply voltage VDD1 according to the feedback voltage VF. .

In the present embodiment, the voltage regulator 20 is a crystal disposed outside the electronic device 1. On the substrate. In some embodiments, voltage regulator 20 is a switch regulator. In some embodiments, the voltage regulator 20 can be implemented as a purely hardware circuit or as a hardware circuit with a firmware or software. In addition, since the principle of the voltage regulator 20 is well known to those of ordinary skill in the art, the details of the voltage regulator 20 will not be described herein.

Furthermore, since the circuit pin 110 of the electronic device 1 is easily exposed by the path between the electronic device 1 and the voltage regulator 20 (ie, the PCB path) and the internal wiring of the electronic device 1 (IC), the parasitic impedances Z1 and Z2 are respectively generated. The effect, therefore, the supply voltage VDD2 of the circuit pin 110 is not exactly equal to the first supply voltage VDD1 provided for the voltage regulator 20. For example, in the embodiment of FIG. 1, it is assumed that the equivalent circuit of the PCB path can be composed of the resistor R1, the inductor L1, and the capacitor C1, and the equivalent circuit of the internal wire bonding of the IC can be performed by the resistor R2, the inductor L2, and the capacitor C2. Composition, and the parasitic impedances Z1 and Z2 in Figure 1 can be expressed as: Z _PCB = R _PCB + L _PCB (1)

Z _WB =R _WB +L _WB (2)

Among them, Z _PCB and Z _WB are the impedance values of the parasitic impedance Z1, R _PCB and R _WB are the impedance values of the resistors R1 and R2, respectively, and L _PCB and L _WB are the impedance values of the inductors L1 and L2, respectively. The second power voltage VDD2 on the first circuit pin 110 can be expressed as: Vin=Vout-I*(Z _PCB +Z _WB ) (3)

Here, Vin is the value of the power supply voltage VDD2, Vout is the value of the power supply voltage VDD1, and I is the value of the load current I1. Obviously, for the conventional implementation (that is, the output 210 of the voltage regulator 20 is coupled to the feedback terminal 220), the feedback voltage obtained by the voltage regulator 20 does not reflect the power input to the actual input device 1. Voltage (ie, power supply voltage VDD2), that is, voltage regulator 20 is referenced The feedback voltage is confirmed, and the undesired output voltage (ie, the power supply voltage VDD1) is adjusted.

In view of this, the electronic device 1 is coupled to the feedback terminal 220 of the voltage regulator 20 via a circuit pin 120 additionally added to the same wafer substrate, so that the voltage regulator 20 can obtain a power source corresponding to the internal of the actual input electronic device 1. The feedback voltage VF of the voltage VDD2 serves as the feedback voltage of the voltage regulator 20, thereby enabling the voltage regulator 20 to adjust the desired output voltage (ie, the power supply voltage VDD1).

To further illustrate how the feedback voltage VF on the circuit pin 120 can be brought close to the power supply voltage VDD2 inside the actual input electronic device 1, an embodiment is proposed in the present invention. Referring to FIG. 1, the electronic device 1 may further include a resistor R3. And capacitor C3. The first end of the resistor R3 is coupled to the first circuit pin 110, the second end of the resistor R3 is coupled to the processing circuit 130, and the first end of the capacitor C3 is coupled to the second end of the resistor R3, and the capacitor C3 The second end is coupled to the ground voltage GND.

It should be noted that in other embodiments, the capacitor C3 can also be, for example, a polar capacitor. Therefore, the forward end of the capacitor C3 is coupled to the second end of the resistor R3, and the negative end of the capacitor C3 is coupled to the ground voltage GND.

Furthermore, if the technical features of the processing circuit 130 are not taken into consideration first. That is, when the processing circuit 130 is only considered to couple the second end of the resistor R3 to the second circuit pin 120, the feedback voltage VF on the circuit pin 120 can be expressed as:

Among them, Vin2 is expressed as the value of the feedback voltage VF. Therefore, it should be understood that the technical means of the electronic device 1 provided by the embodiment of the present invention is completely different from the technical means in the conventional implementation. In addition, the voltage regulator 20 can still obtain the actual input corresponding to the actual input when the influence of the voltage decay caused by the increase of the load current I1 increases, whether the electronic device 1 operates in the high-performance mode or the low-performance mode. The feedback voltage VF of the power supply voltage VDD2 inside the IC enables the voltage regulator 20 to adjust An ideal first supply voltage VDD1 is produced.

In this way, the electronic device 1 not only offsets the influence of the voltage decay caused by the PCB path and the internal wire bonding of the electronic device 1, but also causes the power supply voltage inside the actual input electronic device 1 to not change with the load current I1. change. In view of this, when operating in the high-performance mode, the electronic device 1 can still obtain a stable power supply voltage, and in the case of operating in the low-performance mode, the electronic device 1 can also reduce the static power consumption loss.

On the other hand, in other embodiments, the voltage regulator 20 of FIG. 1 may be similarly disposed on the same wafer substrate inside the electronic device 1. In other words, the circuit pin 110, the circuit pin 120, the processing circuit 130, and the voltage regulator 20 can also be disposed on the same wafer substrate. Referring to FIG. 2, FIG. 2 is a schematic circuit diagram of an electronic device according to another embodiment of the present disclosure.

Compared to the electronic device 1 of Fig. 1, the electronic device 1' of Fig. 2 mainly includes an internal circuit 10 and a voltage regulator 20'. The voltage regulator 20' also includes an output terminal 210 and a feedback terminal 220, and the internal circuit 10 includes a connection pad 110', a connection pad 120', and a processing circuit 130.

Wherein, the connection pad 110' of FIG. 2 is similar to the circuit pin 110 of FIG. 1, and the connection pad 120' of FIG. 2 is similar to the circuit pin 120 of FIG. Therefore, the connection pad 110' is coupled to the output terminal 210 of the voltage regulator 20' and is configured to receive the power supply voltage VDD1 such that the connection pad 110' has the power supply voltage VDD2. The connection pad 120' is coupled to the feedback terminal 220 of the voltage regulator 20'.

The processing circuit 130 is coupled to the connection pad 110' and the connection pad 120', and is configured to generate a feedback voltage VF to the connection pad 120' according to the power supply voltage VDD2, so that the voltage regulator 20' adjusts the power supply voltage VDD1 according to the feedback voltage VF.

In addition, since the connection pads 110', 120', the processing circuit 130, and the voltage regulator 20' are disposed on the same wafer substrate, in the embodiment of FIG. 2, the electronic device 1' will be subjected to the wiring on the IC chip. The effect of the generated parasitic impedance Z3. Thus, the power supply voltage VDD2 on the connection pad 110' can be represented.

Vin=Vout-I*Z _WB ' (5)

Where Z _WB ' is expressed as the impedance value of the parasitic impedance Z3. On the other hand, for the prior art for the purpose of reducing static power loss, dynamic voltage frequency scaling (DVFS) is a widely used technical means in recent years. To put it simply, DVFS can adjust the power supply voltage inside the input IC to a low voltage level when the IC inside the IC detects that the IC is operating in low-efficiency mode to achieve energy saving. Therefore, the main implementation of DVFS is to enable the internal processor of the IC to communicate with the voltage regulator through a communication protocol interface, so that the voltage regulator adjusts the output voltage that is expected by the IC. The high cost of the above method will also make the design on the IC circuit more complicated.

In order to solve the above problems, the present invention further provides an implementation manner. Referring to FIG. 3, FIG. 3 is a schematic diagram of a processing circuit in an electronic device according to an embodiment of the present disclosure. The processing circuit 130 can be implemented in the electronic device 1 of FIG. 1 or the electronic device 1' of FIG. 2, but the present invention does not Limited. For convenience of explanation, the processing circuit 130 of the present embodiment will be described with an example for execution on the electronic device 1. Therefore, reference is made to FIG. 1 for easy understanding. In addition, the components in FIG. 3 that are the same as those in FIG. 1 are denoted by the same reference numerals, and thus will not be further described herein.

The processing circuit 130 includes a processor 131 and a compensation circuit 133. The processor 131 can be, for example, a central processor or a general processor internal to the IC. In addition, the compensation circuit 133 is coupled to the circuit pin 110, the processor 131, and the circuit pin 120. The compensation circuit 133 is configured to generate the voltage according to the power supply voltage VDD2 on the circuit pin 110 and the control signal TS outputted by the processor 131. The feedback voltage VF is outputted to the second circuit pin 120.

Therefore, the electronic device 1 of the embodiment of the present invention will adopt a technical means that is completely different from the DVFS, and the processor 131 controls the voltage regulator 20 coupled to each other to adjust the output voltage (ie, the power supply voltage VDD1). Not only does it reduce development costs, but it also makes designing on IC circuits simpler. However, due to the processing in Figure 3 The circuit 130 generates the feedback voltage VF according to the power supply voltage VDD2 and the control signal TS. Therefore, the resistor R3 and the capacitor C3 in the electronic device 1 can also be omitted.

Still further, reference is made to FIG. 4 to illustrate implementation details of the compensation circuit 133 of FIG. 4 is a circuit diagram of a compensation circuit in the processing circuit of FIG. However, FIG. 4 is only one implementation of the compensation circuit 133 of the embodiment, and is not limited thereto.

Referring to FIG. 1, FIG. 3 and FIG. 4 together, the control signal TS includes a switch control signal TS1 and a switch control signal TS2. In addition, the compensation circuit 133 includes two sets of the resistor array 1331 and the resistor array 1333. In detail, the resistor array 1331 is composed of N resistors Ra_1~Ra_N connected in parallel with each other, and the first end of each of the resistors Ra_1~Ra_N is coupled to the circuit pin 120, and each of the resistors Ra_1~Ra_N The two ends are respectively coupled to the switch circuits SW1_1~SW1_N, and the switch circuits SW1_1~SW1_N are controlled by the switch control signal TS1 to selectively turn on the first end of the resistors Ra_1~Ra_N and the ground voltage GND.

The second resistor array 1333 is composed of M resistors Rb_1~Rb_M connected in parallel with each other, and the first ends of each of the resistors Rb_1~Rb_M are commonly coupled to the circuit pin 110, and each of the resistors Rb_1~Rb_M The two ends are respectively coupled to the switch circuits SW2_1~SW2_M, and the switch circuits SW2_1~SW2_M are controlled by the switch control signal TS2, thereby selectively turning on the second ends of the resistors Rb_1~Rb_M and the first ends of the resistors Ra_1~Ra_N. In some embodiments, M and N can be positive integers greater than or equal to two.

Therefore, the voltage regulator 20 can adjust the supplied first power supply voltage VDD1 according to the feedback voltage VF output from the compensation circuit 130. In this way, the electronic device 1 of the embodiment of the present invention can not only reduce the static power consumption loss in the low performance mode, but also have the function of dynamically changing the feedback voltage VF, so that the voltage regulator 20 can adjust the compliance electronic device 1 accordingly. The power supply voltage that is expected to be received.

This case also does not limit the specific implementation of the switch control signal TS1 and the switch control signal TS2, so those with ordinary knowledge in the technical field should be able to Used to design.

Finally, referring to FIG. 5 to fully explain the operation flow of the electronic device, FIG. 5 is a flow chart of the input voltage compensation method provided by the embodiment of the present invention. The method described in this example can be performed in the electronic device of the embodiment of FIG. 1 or 2. For convenience of explanation, the method described in this example takes the electronic device 1 of FIG. 1 as an example.

In step S501, the circuit pin 110 receives the power supply voltage VDD1 supplied from the output terminal of the voltage regulator 20 such that the circuit pin 110 has the power supply voltage VDD2.

In step S503, the processing circuit 130 generates a feedback voltage VF according to the power supply voltage VDD2 of the circuit pin 110 to the second circuit pin 120, and causes the voltage regulator to adjust the power supply voltage VDD1 according to the feedback voltage VF.

In summary, the electronic device and the input voltage compensation method provided by the embodiments of the present invention can be coupled to the feedback terminal of the voltage regulator by additionally adding circuit pins on the same wafer substrate, thereby reducing the PCB path and the IC. The effect of voltage decay caused by internal wire bonding and the loss of power consumption of the IC operating in low-performance mode. In addition, the above electronic device and the input voltage compensation method can also generate a feedback voltage through the internal resistance array of the IC to control the voltage regulator to adjust the output voltage that is required by the IC.

1‧‧‧Electronic device

110, 120‧‧‧ circuit pins

130‧‧‧Processing Circuit

20‧‧‧Voltage regulator

210‧‧‧ Output

220‧‧‧reporting end

VDD1, VDD2‧‧‧ power supply voltage

VF‧‧‧ feedback voltage

Z1, Z2‧‧‧ parasitic impedance

R1, R2, R3‧‧‧ resistance

C1, C2, C3‧‧‧ capacitors

L1, L2‧‧‧ inductance

I1‧‧‧Load current

GND‧‧‧ Grounding voltage

Claims (10)

An electronic device includes: a first circuit pin coupled to an output of a voltage regulator, and configured to receive a first supply voltage provided by the output of the voltage regulator, such that The first circuit pin has a second power voltage, wherein the second power voltage is different from the first power voltage; a second circuit pin is coupled to a feedback terminal of the voltage regulator; and a processing The circuit is coupled to the first circuit pin and the second circuit pin, and configured to generate a feedback voltage to the second circuit pin according to the second power voltage of the first circuit pin, such that the voltage The regulator adjusts the first power voltage according to the feedback voltage. The electronic device of claim 1, further comprising: a resistor having a first end coupled to the first circuit pin, and a second end coupled to the processing circuit, wherein the processing circuit is The second end of the resistor is coupled to the second circuit pin; and a capacitor has a first end coupled to the second end of the resistor, and a second end coupled to a ground voltage . The electronic device of claim 1, wherein the first circuit pin, the second circuit pin, and the processing circuit are disposed on the same wafer substrate. The electronic device of claim 1, wherein the processing circuit further comprises: a processor; and a compensation circuit coupled to the first circuit pin, the processor and the second circuit pin, and The feedback voltage is generated according to the second power voltage and a control signal output by the processor. The electronic device of claim 4, wherein the control signal comprises a first switch control signal and a second switch control signal, and the compensation circuit comprises a first resistor array and a second resistor array, wherein the The first resistor array is composed of N first resistors connected in parallel with each other, and a first end of each of the first resistors The second circuit is coupled to the second circuit pin, and the second end of each of the first resistors is coupled to a first switch circuit, and the first switch circuits are controlled by the first switch control signal. The second resistor array is formed by selectively connecting the first ends of the first resistors with the ground voltage, and the second resistor array is formed by M second resistors connected in parallel with each other, and one of each of the second resistors The first end is coupled to the first circuit pin, and the second end of each of the second resistors is respectively coupled to a second switch circuit, and the second switch circuits are controlled by the second switch Controlling a signal to selectively turn on the second ends of the second resistors and the first ends of the first resistors, where M and N are positive integers greater than or equal to 2. An electronic device comprising: a voltage regulator comprising an output terminal and a feedback terminal; and an internal circuit comprising: a first connection pad coupled to the output end of the voltage regulator, and configured to receive the a first supply voltage provided by the output of the voltage regulator, the first connection pad having a second supply voltage, wherein the second supply voltage is different from the first supply voltage; a second connection pad, coupled Connected to the feedback terminal of the voltage regulator; and a processing circuit coupled to the first connection pad and the second connection pad, and configured to generate a feedback according to the second power supply voltage of the first connection pad The voltage is applied to the second connection pad such that the voltage regulator adjusts the first power supply voltage according to the feedback voltage. The electronic device of claim 6, the internal circuit further comprising: a resistor having a first end coupled to the first connection pad, and a second end coupled to the processing circuit, wherein the processing The circuit is configured to couple the second end of the resistor to the second connection pad; and a capacitor having a first end coupled to the second end of the resistor, and a second end coupled to the ground Voltage. The electronic device of claim 6, wherein the first connection pad, the second The connection pads, the processing circuit, and the voltage regulator are commonly disposed on the same wafer substrate. The electronic device of claim 6, wherein the processing circuit further comprises: a processor; and a compensation circuit coupled to the first connection pad, the processor and the second connection pad, and configured to The second power voltage and a control signal output by the processor generate the feedback voltage. An input voltage compensation method is implemented in an electronic device, the electronic device includes a first circuit pin, a second circuit pin, and a processing circuit, wherein the first circuit pin is coupled to the processing circuit and a An output terminal of the voltage regulator, and the second circuit pin is coupled to the processing circuit and a feedback terminal of the voltage regulator, the input voltage compensation method includes: using the first circuit pin, receiving from the first circuit pin a first supply voltage provided by the output of the voltage regulator, the first circuit pin having a second supply voltage, wherein the second supply voltage is different from the first supply voltage; and utilizing the processing circuit And generating, according to the second power voltage of the first circuit pin, a feedback voltage to the second circuit pin, and causing the voltage regulator to adjust the first power voltage according to the feedback voltage.