High-dynamic range low ripple voltage multiplier

• US 7,795,951 B2
• Filed: 11/30/2007
• Issued: 09/14/2010
• Est. Priority Date: 11/30/2007
• Status: Active Grant

• Current Assignee: NXP USA, Inc. (NXP Semiconductors NV)
• Original Assignee: Freescale Semiconductor, Inc. (NXP Semiconductors NV)
• Inventors: Choy, Jon S.
• Primary Examiner(s): Donovan; Lincoln
• Assistant Examiner(s): ROJAS, DANIEL E
• Application Number:
  US11/948,005
• Publication Number:
  US 20090140795A1
• Time in Patent Office: 1,019 Days
• Field of Search: 327/536
• US Class Current: 327/536
• CPC Class Codes: H02M 3/073 Charge pumps of the Schenkel-type

Abstract

A voltage multiplier (10) including a first clocked multiplier stage (12) having an input and an output and a second clocked multiplier stage (14, 16) having an input and an output is provided. The voltage multiplier further includes an input level regulator (18) coupled to the input of the first multiplier stage. The voltage multiplier further includes a feedback bias control circuit (32) coupled to the input level regulator, wherein the feedback bias control circuit is further coupled to receive the output (50) of the second multiplier stage, and wherein the feedback bias control circuit generates a feedback signal (58) affecting an output of the input level regulator based on a comparison between a voltage proportional to a voltage at the output of the second clocked multiplier stage and a reference voltage.

Claims

1. A voltage multiplier comprising:

a first clocked multiplier stage having an input and an output;

a second clocked multiplier stage having an input and an output;

an input level regulator having an input coupled to receive a supply voltage, a control input, and an output coupled to the input of the first multiplier stage; and

a feedback bias control circuit coupled to the control input of the input level regulator, wherein the feedback bias control circuit is further coupled to receive the output of the second multiplier stage, and wherein the feedback bias control circuit generates a feedback signal for regulating an output voltage at the output of the input level regulator to a continuous range of voltage levels based on a comparison between a voltage proportional to a voltage at the output of the second clocked multiplier stage and a reference voltage.

2. The voltage multiplier of claim 1, wherein the feedback bias control circuit is further coupled to a generator of a clock coupled to the first clocked multiplier stage, such that the feedback signal affects a magnitude of the clock coupled to the first clocked multiplier stage.

3. The voltage multiplier of claim 1, wherein the feedback bias control circuit is further coupled to a generator of a clock coupled to the second clocked multiplier stage, such that the feedback signal affects a magnitude of the clock coupled to the second clocked multiplier stage.

4. The voltage multiplier of claim 1, wherein the feedback bias control circuit comprises one of a switched resistor-divider or a switched capacitor-divider to generate the voltage proportional to the voltage at the output of the second clocked multiplier stage.

5. The voltage multiplier of claim 4, wherein the feedback bias control circuit further comprises an operational amplifier for comparing the voltage proportional to the voltage at the output of the second clocked multiplier stage and the reference voltage.

6. The voltage multiplier of claim 4, wherein the one of the switched resistor-divider and the switched-capacitor divider is configured to dynamically change a value of the voltage proportional to the voltage at the output of the second clocked multiplier stage in response to at least one control signal.

7. The voltage multiplier of claim 1, wherein the first clocked multiplier stage is identical to the second clocked multiplier stage.

8. The voltage multiplier of claim 1, wherein the first clocked multiplier stage is different from the second clocked multiplier stage.

9. A voltage multiplier comprising:

a first clocked multiplier stage having an input and an output;

a second clocked multiplier stage having an input and an output, wherein the output of the first clocked multiplier stage is coupled to the input of the second multiplier stage;

an input level regulator having an input for receiving a supply voltage, an output coupled to provide an output voltage to the input of the first clocked multiplier stage, and a control input;

a first regulated clock coupled to a first control input of the first multiplier stage;

a second regulated clock coupled to a second control input of the first multiplier stage;

a third regulated clock coupled to a first control input of the second multiplier stage;

a fourth regulated clock coupled to a second control input of the second multiplier stage;

a feedback bias control circuit coupled to the control input of the input level regulator, wherein the feedback bias control circuit is further coupled to receive the output of the second multiplier stage, and wherein the feedback bias control circuit generates a feedback signal for regulating the output voltage of the input level regulator to a continuous range of voltage levels based on a comparison between a voltage proportional to a voltage at the output of the second clocked multiplier stage and a reference voltage, wherein the feedback bias control circuit is further coupled to the first regulated clock, such that the feedback signal affects an output voltage of the first regulated clock, wherein the feedback bias control circuit is further coupled to the second regulated clock, such that the feedback signal affects an output voltage of the second regulated clock, wherein the feedback bias control circuit is further coupled to the third regulated clock, such that the feedback signal affects an output voltage of the third regulated clock, and feedback bias control circuit is further coupled to the fourth regulated clock, such that the feedback signal affects an output voltage of the fourth regulated clock.

10. The voltage multiplier of claim 9, wherein the feedback bias control circuit comprises one of a switched resistor-divider or a switched capacitor-divider to generate the voltage proportional to the voltage at the output of the second multiplier stage.

11. The voltage multiplier of claim 10, wherein the feedback bias control circuit further comprises an operational amplifier for comparing the voltage proportional to the voltage at the output of the second clocked multiplier stage and the reference voltage.

12. The voltage multiplier of claim 10, wherein the one of the switched resistor-divider or the switched-capacitor divider is configured to dynamically change a value of the voltage proportional to the voltage at the output of the second clocked multiplier stage in response to at least one control signal.

13. The voltage multiplier of claim 9, wherein the first clocked multiplier stage is identical to the second clocked multiplier stage.

14. The voltage multiplier of claim 9, wherein the first clocked multiplier stage is different from the second clocked multiplier stage.

15. The voltage multiplier of claim 9, wherein each of the first clocked multiplier stage and the second clocked multiplier stage comprises a pair of cross-coupled transistors and two pumping capacitors.

16. A voltage multiplier comprising:

a first clocked multiplier stage having an input, a control input, and an output;

a second clocked multiplier stage having an input, a control input, and an output, wherein the output of the first clocked multiplier stage is coupled to the input of the second multiplier stage;

a first regulated clock coupled to the control input of the first clocked multiplier stage;

a second regulated clock coupled to the control input of the second clocked multiplier stage;

an input level regulator, wherein the input level regulator comprises a transistor having a first current electrode coupled to receive a supply voltage, a second current electrode coupled to the input of the first clocked multiplier stage, and a control electrode coupled to receive a feedback signal; and

a feedback bias control circuit coupled to provide the feedback signal to the control electrode of the transistor, wherein the feedback bias control circuit is further coupled to receive the output of the second clocked multiplier stage, and wherein the feedback bias control circuit generates the feedback signal for regulating an output voltage of the input level regulator to a continuous range of voltage levels based on a comparison between a voltage proportional to a voltage at the output of the second clocked multiplier stage and a reference voltage.

17. The voltage multiplier of claim 16, wherein the feedback bias control circuit is further coupled to the first regulated clock and the second regulated clock, such that the feedback signal affects an output voltage of the first regulated clock and an output voltage of the second regulated clock.

18. The voltage multiplier of claim 16, wherein the feedback bias control circuit comprises one of a switched resistor-divider or a switched capacitor-divider to generate the voltage proportional to the voltage at the output of the second clocked multiplier stage.

19. The voltage multiplier of claim 16, wherein each of the first clocked multiplier stage and the second clocked multiplier stage comprises a diode and a pumping capacitor.