RECTIFIER CIRCUIT AND RFID TAG
First Claim
1. A rectifier circuit comprising:
- a first MOS transistor;
a first capacitor configured to connect between a gate and a source of the first MOS transistor;
a first switching circuit configured to supply a bias voltage to the first capacitor in response to a control signal;
a second MOS transistor whose drain is connected to the source of the first MOS transistor;
a second capacitor configured to connect between a gate and a source of the second MOS transistor;
a second switching circuit configured to supply the bias voltage to the second capacitor in response to the control signal;
a third MOS transistor configured to imitate the first MOS transistor;
a third capacitor configured to imitate the first capacitor;
a fourth capacitor connected between a drain of the first MOS transistor and the source of the second MOS transistor, a direct current being supplied through the fourth capacitor with respect to an alternating current supplied to the source of the first MOS transistor;
a dummy switching circuit configured to supply the bias voltage to the third capacitor in response to the control signal; and
a generating circuit configured to generate the control signal based on a potential of the third capacitor.
1 Assignment
0 Petitions
Accused Products
Abstract
A rectifier circuit includes a first MOS transistor; a first capacitor connected between a gate and a source of the first MOS transistor; a first switching circuit for supplying a bias voltage to the first capacitor in response to a control signal; a second MOS transistor whose drain is connected to the source of the first MOS transistor; a second capacitor connected between a gate and a source of the second MOS transistor; and a second switching circuit for supplying the bias voltage to the second capacitor in response to the control signal. The rectifier circuit also includes a third MOS transistor for imitating the first MOS transistor; a third capacitor for imitating the first capacitor; a dummy switching circuit for supplying the bias voltage to the third capacitor in response to the control signal; and a generating circuit for generating the control signal based on a potential of the third capacitor.
29 Citations
19 Claims
-
1. A rectifier circuit comprising:
-
a first MOS transistor; a first capacitor configured to connect between a gate and a source of the first MOS transistor; a first switching circuit configured to supply a bias voltage to the first capacitor in response to a control signal; a second MOS transistor whose drain is connected to the source of the first MOS transistor; a second capacitor configured to connect between a gate and a source of the second MOS transistor; a second switching circuit configured to supply the bias voltage to the second capacitor in response to the control signal; a third MOS transistor configured to imitate the first MOS transistor; a third capacitor configured to imitate the first capacitor; a fourth capacitor connected between a drain of the first MOS transistor and the source of the second MOS transistor, a direct current being supplied through the fourth capacitor with respect to an alternating current supplied to the source of the first MOS transistor; a dummy switching circuit configured to supply the bias voltage to the third capacitor in response to the control signal; and a generating circuit configured to generate the control signal based on a potential of the third capacitor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
-
16. A radio frequency identification tag comprising:
-
an antenna; a first MOS transistor; a first capacitor configured to connect between a gate and a source of the first MOS transistor; a first switching circuit configured to supply a bias voltage to the first capacitor in response to a control signal; a second MOS transistor whose drain is connected to the source of the first MOS transistor; a second capacitor configured to connect between a gate and a source of the second MOS transistor; a second switching circuit configured to supply the bias voltage to the second capacitor in response to the control signal; a third MOS transistor configured to imitate the first MOS transistor; a third capacitor configured to imitate the first capacitor; a fourth capacitor connected between a drain of the first MOS transistor and the source of the second MOS transistor; a dummy switching circuit configured to supply the bias voltage to the third capacitor in response to the control signal; a generating unit configured to generate the control signal based on a potential of the third capacitor; a battery configured to be charged with a direct current supplied through the fourth capacitor with respect to an alternating current supplied to the source of the first MOS transistor; and a control circuit configured to transmit tag identification information via the antenna based on the direct current. - View Dependent Claims (17)
-
-
18. A radio frequency identification tag comprising:
-
an antenna; a first MOS transistor; a first capacitor configured to connect between a gate and a source of the first MOS transistor; a first switching circuit configured to supply a bias voltage to the first capacitor in response to a control signal; a second MOS transistor whose drain is connected to the source of the first MOS transistor; a second capacitor configured to connect between a gate and a source of the second MOS transistor; a second switching circuit configured to supply the bias voltage to the second capacitor in response to the control signal; a third MOS transistor configured to imitate the first MOS transistor; a third capacitor configured to imitate the first capacitor; a fourth capacitor connected between a drain of the first MOS transistor and the source of the second MOS transistor; a dummy switching circuit configured to supply the bias voltage to the third capacitor in response to the control signal; a generating unit configured to generate the control signal based on a potential of the third capacitor; a supplying unit configured to supply the bias voltage to the third capacitor in response to a reset signal; a battery configured to be charged with a direct current supplied through the fourth capacitor with respect to an alternating current supplied to the source of the first MOS transistor; and a control circuit configured to transmit tag identification information via the antenna based on the direct current, and outputs the reset signal when the control circuit enters suspend state from running state. - View Dependent Claims (19)
-
Specification