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US 6,606,489 B2Granted
Differential to single-ended converter with large output swing
AssigneeRF Micro Devices, Inc.
InventorsBehzad Razavi, Pengfei Zhang
Life of this patent
Estimating the term…
Abstract
A method and apparatus of converting differential signals to single-ended signals. The method includes receiving a differential signal comprising a first current and a second current and applying the second current to a first load to generate a first voltage. A third current is generated in response to the first voltage. The first current is summed with the third current and applied to a second load to generate the single-ended signal.
Claims38
A method for converting a differential signal to a single-ended signal comprising:
- receiving the differential signal comprising a first current and a second current;
- applying the second current to a first load to generate a first voltage;
- generating a third current in response to the first voltage;
- summing the first current with the third current;
- and
- applying the sum of the first current and the third current to a second load to generate the single-ended signal.
3 more elements
A transmitter circuit comprising:
- a converter circuit having a first terminal configured to receive a first current and provide an output voltage, and a second terminal configured to receive a second current, the converter circuit comprising:
- a first load, coupled between a third terminal and the second terminal, and configured to convert the second current to a first voltage;
- a transconductance, coupled to the second terminal and the first terminal, and configured to convert the first voltage to a third current;
- and
- a second load, coupled between a fourth terminal and the first terminal, and configured to convert a sum of the first current and the third current to the output voltage.
2 more elements
A transceiver comprising:
- a receiver circuit coupled to a transmitter, the transmitter comprising:
- a converter circuit having a first terminal configured to receive a first current and provide an output voltage and a second terminal configured to receive a second current, the converter circuit comprising:
- a first load, coupled between a third terminal and the second terminal, and configured to convert the second current to a first voltage;
- a transconductance, coupled to the second terminal and the first terminal, and configured to convert the first voltage to a third current;
- and
- a second load, coupled between a fourth terminal and the first terminal and configured to convert a sum of the first current and the third current to the output voltage;
- a power amplifier having an input terminal coupled to the first terminal of the converter circuit;
- and
- a mixer having output terminals coupled to the first terminal and the second terminal of the converter circuit,
- wherein the third current is approximately inversely proportional to the first voltage, and
- wherein the third terminal and fourth terminal are coupled together and configured to receive a first reference voltage.
8 more elements
An electronic system comprising a transceiver coupled to an interface bus, the electronic system being capable of wireless data communication with another electronic system via the transceiver, the transceiver comprising:
- a receiver circuit coupled to a transmitter, the transmitter comprising:
- a converter circuit having a first terminal configured to receive a first current and provide an output voltage, and a second terminal configured to receive a second current, the converter circuit comprising:
- a first load, coupled between a third terminal and the second terminal, and configured to convert the second current to a first voltage;
- a transconductance, coupled to the second terminal and the first terminal, and configured to convert the first voltage to a third current;
- and
- a second load, coupled between a fourth terminal and the first terminal, and configured to convert a sum of the first current and the third current to the output voltage;
- a power amplifier having an input terminal coupled to the first terminal of the converter circuit;
- and
- a mixer having output terminals coupled to the first terminal and the second terminal of the converter circuit,
- wherein the third current is approximately inversely proportional to the first voltage, and
- wherein the third terminal and fourth terminal are coupled together and configured to receive a first reference voltage.
8 more elements
A converter circuit comprising:
- a first inductor coupled between a first terminal receiving a first current signal and a second terminal;
- a second inductor coupled between a third terminal receiving a second current signal and a fourth terminal;
- and
- a first transistor coupled between the third terminal and a fifth terminal, having a control electrode coupled to the first terminal,
- wherein the first current signal and the second current signal form a differential current signal, and a single-ended voltage output is generated at the third terminal in response to the differential current signal.
2 more elements
A transmitter comprising:
- a converter circuit comprising:
- a first inductor coupled between a first terminal receiving a first current signal and a second terminal;
- a second inductor coupled between a third terminal receiving a second current signal and fourth terminal;
- a first transistor coupled between the third terminal and a fifth terminal, having a control electrode coupled to the first terminal;
- and
- a current source coupled to the fifth terminal,
- wherein the first current signal and the second current signal form a differential current signal, and a single-ended voltage output is generated at the third terminal in response to differential current signal, and
- wherein the second terminal receives a first reference voltage, and the fourth terminal is coupled to the second terminal;
- a power amplifier coupled to the third terminal of the converter circuit;
- and
- a mixer coupled to the first terminal and the third terminal of the converter circuit.
8 more elements
A transceiver comprising a transmitter coupled to a receiver circuit, the transmitter comprising:
- a convert circuit comprising:
- a first inductor coupled between a first terminal receiving a first current signal and a woo terminal;
- a second inductor coupled between a third terminal receiving a second current signal and a fourth terminal;
- a first transistor coupled between the third terminal and a fifth terminal, having a control electrode coupled to the first terminal;
- and
- a current source coupled to the fifth terminal,
- wherein the first current signal and the second current signal form a differential current signal, and a single-ended voltage output is generated at the third terminal in response to th differential current signal, and
- wherein the second terminal receives a first reference voltage, and the fourth terminal is coupled to the second terminal;
- a power amplifier coupled to the third terminal of the converter circuit;
- and
- a mixer coupled to the first terminal and the third terminal of the converter circuit.
8 more elements
An electronic system comprising a transceiver coupled to an interface bus, the electronic system being capable of wireless data communication with aria electronic system via the transceiver, the transceiver comprising:
- a converter circuit comprising:
- a first inductor coupled between a first terminal receiving a first current signal and a sec terminal;
- a second inductor coupled between a third terminal receiving a second current signal and a fourth terminal;
- a first transistor coupled between the third terminal and a fifth terminal, having a control electrode coupled to the first terminal;
- and
- a current source coupled to the fifth terminal,
- wherein the first current signal and the second current signal form a different current signal and a single-ended voltage output is generated at the third terminal in response to the differential current signal, and
- wherein the second terminal receives a first reference voltage, and the fourth terminal is coupled to the second terminal;
- a power amplifier coupled to the third terminal of the converter circuit;
- and
- a mixer coupled to the first terminal and the third terminal of the converter circuit.
8 more elements
Dependencies are inferred from the claim text.