Shunt regulator circuit having a split output
First Claim
1. A shunt regulator powered from an RF rectifier block, the shunt regulator comprising:
- an input node for receiving a power supply voltage from the RF rectifier block;
a first diode having an anode coupled to the input node;
a second diode having an anode coupled to the input node;
a resistor divider and amplifier circuit coupled between a cathode of the first diode and ground;
a transistor having a control terminal coupled to an output of the resistor divider and amplifier circuit, and a current path coupled between a cathode of the second diode and ground; and
a split output comprising a first output for providing a power delivery path to power RFID circuits including a FRAM memory circuit formed on-chip with the shunt regulator, and a second output for providing a discharge-regulation path to regulate power supply voltage from the RF rectifier block,wherein the cathode of the first diode forms the first output of the split rectifier output and the cathode of the second diode forms the second output.
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Accused Products
Abstract
A shunt regulator for an RFID tag chip is powered from split outputs from the RF rectifier, including a first output for providing a power delivery path to on-chip circuits and a second output for providing a discharge-regulation path. The shunt regulator includes a capacitor coupled between the first output and ground. The shunt regulator further includes an input node for receiving a power supply voltage from the rectifier split outputs, a first diode having an anode coupled to the input node, a second diode having an anode coupled to the input node, a resistor divider circuit and amplifier coupled between a cathode of the first diode and ground, transistor having a control terminal coupled to an output of the resistor divider and amplifier circuit, and a current path coupled between a cathode of the second diode and ground.
65 Citations
16 Claims
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1. A shunt regulator powered from an RF rectifier block, the shunt regulator comprising:
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an input node for receiving a power supply voltage from the RF rectifier block; a first diode having an anode coupled to the input node; a second diode having an anode coupled to the input node; a resistor divider and amplifier circuit coupled between a cathode of the first diode and ground; a transistor having a control terminal coupled to an output of the resistor divider and amplifier circuit, and a current path coupled between a cathode of the second diode and ground; and a split output comprising a first output for providing a power delivery path to power RFID circuits including a FRAM memory circuit formed on-chip with the shunt regulator, and a second output for providing a discharge-regulation path to regulate power supply voltage from the RF rectifier block, wherein the cathode of the first diode forms the first output of the split rectifier output and the cathode of the second diode forms the second output. - View Dependent Claims (2, 3, 4, 5)
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6. A shunt regulation method comprising;
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providing a shunt regulator including; a first diode having an anode coupled to am input node; a second diode having an anode coupled to the input node; a resistor divider and amplifier circuit coupled between a cathode of the first diode and ground; and a transistor having a control terminal coupled to an output of the resistor divider circuit, and a current path coupled between a cathode of the second diode and ground; and receiving on the input node of the shunt regulator a power supply voltage from a RF rectifier output; providing on a first output of the shunt regulator a power delivery path to power RFID circuits including a FRAM memory circuit formed on-chip with the shunt regulator; and providing on a second output of the shunt regulator a separate discharge-regulation path to regulate the power supply voltage from the RF rectifier block, wherein the cathode of the first diode forms the first output of the split rectifier output and the cathode of the second diode forms the second output. - View Dependent Claims (7, 8, 9, 10)
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11. A shunt regulator for an RFID tag chip, the shunt regulator comprising:
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an input node for receiving a power supply voltage from a rectifier output; a first diode having an anode coupled to the input node; a second diode having an anode coupled to the input node; a resistor divider and amplifier circuit coupled between a cathode of the first diode and ground; a transistor having a control terminal coupled to an output of the resistor divider circuit, and a current path coupled between a cathode of the second diode and ground; and a split output comprising a first output for providing a power delivery path to power on-chip RFID circuits including a FRAM memory circuit, and a second output for providing a discharge-regulation path to regulate power supply voltage from the rectifier output, wherein the cathode of the first diode forms the first output of the split output RF rectifier circuit and the cathode of the second diode forms the second output. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification