RF power detector circuits
First Claim
1. A radio frequency (RF) power detector comprising:
- a first circuit comprising;
a first rectifying diode comprising a first terminal coupled to a first power supply voltage node;
an input terminal coupled to a second terminal of the first rectifying diode;
a first transistor comprising a first collector coupled to the second terminal of the first rectifying diode, and a first emitter coupled to a reference voltage node;
a second transistor comprising a second emitter coupled to the reference voltage node, and a second collector coupled to a second power supply voltage node;
a low-pass filter network coupled between a first base of the first transistor and a second base of the second transistor; and
a first output terminal coupled to the second collector of the second transistor.
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Accused Products
Abstract
A radio frequency (RF) power detector includes a first circuit having a first rectifying diode with a first terminal coupled to a first power supply voltage node. The first circuit also includes an input terminal coupled to a second terminal of the first rectifying diode, a first transistor having a first collector coupled to the second terminal of the first rectifying diode and a first emitter coupled to a reference voltage node, and a second transistor having a second emitter coupled to the reference voltage node and a second collector coupled to a second power supply voltage node. The first circuit further includes a low-pass filter network coupled between a first base of the first collector and a second base of the second transistor, and a first output terminal coupled to the second collector of the second transistor.
11 Citations
23 Claims
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1. A radio frequency (RF) power detector comprising:
a first circuit comprising; a first rectifying diode comprising a first terminal coupled to a first power supply voltage node; an input terminal coupled to a second terminal of the first rectifying diode; a first transistor comprising a first collector coupled to the second terminal of the first rectifying diode, and a first emitter coupled to a reference voltage node; a second transistor comprising a second emitter coupled to the reference voltage node, and a second collector coupled to a second power supply voltage node; a low-pass filter network coupled between a first base of the first transistor and a second base of the second transistor; and a first output terminal coupled to the second collector of the second transistor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A radio frequency (RF) circuit comprising:
a first circuit comprising; a first transistor comprising a first emitter coupled to a reference voltage node, a first collector coupled to a first supply voltage node through a first resistor, and a first base coupled to an input terminal, wherein the first emitter has a same voltage as the reference voltage node, wherein a first terminal of the first resistor is coupled to and has a same voltage as the first supply voltage node, and a second terminal of the first resistor is coupled to and has a same voltage as the first collector; a first biasing circuit coupled to the first transistor, wherein the first biasing circuit comprises; a second transistor comprising a second collector coupled to a second supply voltage node via a second resistor, a second emitter coupled to the reference voltage node, and a second base coupled to the first base of the first transistor, wherein the second resistor is a fixed resistor, a first terminal of the second resistor is coupled to and has a same voltage as the second supply voltage node, and a second terminal of the second resistor is coupled to and has same voltage as the second collector, wherein the second collector is coupled to and has the same voltage as a first node between the first base and the second base; a third resistor coupled between the first node and the first base; a fourth resistor coupled between the first node and the second base; and a first output terminal coupled to the first collector of the first transistor. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A method of operating a radio-frequency (RF) circuit, the method comprising:
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setting a bias current of a first transistor using a first resistor, wherein the first resistor is coupled between a collector of the first transistor and a diode, wherein the diode is coupled between a first supply voltage node and the collector of the first transistor, and wherein an emitter of the first transistor is coupled to a reference voltage node; supplying a first RF signal to a first node between the diode and the collector of the first transistor, wherein the supplying induces a current in a first conductive path between the collector of the first transistor and a second node; filtering the current using a low-pass filter network, thereby forming a filtered current, wherein the low-pass filter network comprises; a second resistor coupled between a base of the first transistor and the second node; a second capacitor coupled between the second node and the reference voltage node; and a third resistor coupled between the second node and a base of a second transistor; and converting the filtered current into an output voltage using the second transistor, wherein an emitter of the second transistor is coupled to the reference voltage node, and a collector of the second transistor is coupled to a second supply voltage node via a fourth resistor. - View Dependent Claims (20, 21)
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22. A method of measuring a radio frequency (RF) signal, the method comprising:
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supplying the RF signal to an input port of a coupler; providing, by the coupler, an output signal at a coupled port or an isolated port of the coupler to an input terminal of an RF power detector, wherein a termination load is coupled between a reference voltage node and the coupled port or the isolated port, wherein the RF power detector comprises; a first transistor comprising a first emitter coupled to the reference voltage node, a first collector coupled to a supply voltage node via a first resistor, and a first base coupled to the input terminal; a first biasing circuit coupled to the first transistor, wherein the first biasing circuit comprises a second transistor comprising a second collector coupled to the supply voltage node via a second resistor, a second emitter coupled to the reference voltage node, and a second base coupled to the first base of the first transistor; and an output terminal coupled to the first collector of the first transistor; and measuring a voltage at the output terminal of the RF power detector. - View Dependent Claims (23)
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Specification