Stacked double balanced mixer circuit
First Claim
1. A stacked double balanced mixer, comprising:
- a double balanced mixer comprising;
two input transistors;
four cross coupled output transistors;
first inputs of said two input transistors coupled to a radio frequency (RF) differential signal having an RF carrier frequency; and
second inputs of said four cross coupled output transistors coupled to a first local oscillator differential signal having a first LO frequency; and
a first cross coupled differential mixer comprising;
four cross coupled input/output transistors;
two inputs of said four cross coupled input/output transistors coupled to a second local oscillator (LO) differential signal having a second LO frequency; and
first cross coupled differential mixer outputs of said four cross coupled input/output transistor; and
wherein said four cross coupled input/output transistor have first output terminal pairs DC coupled in series to second output terminal pairs of said four cross coupled output transistor; and
wherein the stacked double balanced mixer generates, at the first cross coupled differential mixer outputs, an IF differential output signal having an IF frequency equal to a difference of the RF carrier frequency and the sum of the first and the second LO frequencies.
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Accused Products
Abstract
A stacked double balanced mixer (220) includes a double balanced mixer (320) and a first cross coupled differential mixer (330). The double balanced mixer (320) includes two input transistors (321, 322) and four cross coupled output transistors (323-326). The first cross coupled differential mixer (330) includes four cross coupled input/output transistors (331-334) and a second mixer output (227, 228). The four cross coupled input/output transistors (331-334) have first output terminal pairs DC coupled in series to second output terminal pairs of the four cross coupled output transistors (323-326). The stacked double balanced mixer (220) generates, at the second mixer output (227,228), a second IF differential output signal having a second IF frequency at a difference of a radio frequency of a differential input signal and the sum of first and second LO frequencies, respectively, of first and second LO signals.
104 Citations
19 Claims
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1. A stacked double balanced mixer, comprising:
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a double balanced mixer comprising; two input transistors; four cross coupled output transistors; first inputs of said two input transistors coupled to a radio frequency (RF) differential signal having an RF carrier frequency; and second inputs of said four cross coupled output transistors coupled to a first local oscillator differential signal having a first LO frequency; and a first cross coupled differential mixer comprising; four cross coupled input/output transistors; two inputs of said four cross coupled input/output transistors coupled to a second local oscillator (LO) differential signal having a second LO frequency; and first cross coupled differential mixer outputs of said four cross coupled input/output transistor; and wherein said four cross coupled input/output transistor have first output terminal pairs DC coupled in series to second output terminal pairs of said four cross coupled output transistor; and wherein the stacked double balanced mixer generates, at the first cross coupled differential mixer outputs, an IF differential output signal having an IF frequency equal to a difference of the RF carrier frequency and the sum of the first and the second LO frequencies. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A receiving device for processing a frequency modulated (FM) ratio signal having a carrier frequency, the FM radio signal including a selective call address, the receiving device comprising:
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an antenna for intercepting the FM signal; a receiver section, coupled to said antenna, for filtering, converting, and demodulating the intercepted FM signal, including the selective call address; a controller, coupled to said receiver section, for decoding the demodulated selective call address, and which generates an alert signal when the selective call address substantially matches an address stored in the receiving device; and a sensible alert, coupled to the controller, which is responsive to the alert signal for generating a sensible alert; and wherein the receiver section comprises a stacked double balanced mixer, coupled to said antenna, for converting the intercepted FM signal; and wherein the stacked double balanced mixer comprises; a double balanced mixer comprising; two input transistor; four cross coupled output transistor; first input of said two input transistors coupled to a radio frequency (RF) differential signal having an RF carrier frequency; and second inputs of said four cross coupled output transistors coupled to a first local oscillator (LO) differential signal having a first LO frequency; and a first cross coupled differential mixer comprising; four cross coupled input/output transistors; two inputs of said four cross coupled input/output transistors coupled to a second local oscillator (LO) differential signal having a second LO frequency; and first cross coupled differential mixer outputs of said four cross coupled input/output transistors; and wherein said four cross coupled input/output transistors have first output terminal pairs DC coupled in series to second output terminal pairs of said four cross coupled output transistors; and wherein the stacked double balanced mixer generates, at the first cross coupled differential mixer outputs, an IF differential output signal having an IF frequency equal to a difference of the RF carrier frequency and the sum of the first and the second LO frequencies. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A stacked double balanced mixer, comprising:
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a double balanced mixer comprising; two NPN input transistors and four cross coupled output transistors, wherein each of said two NPN input transistors has a collector which is direct current (DC) coupled, respectively, to one of two emitter pairs of said four cross coupled output transistors; first input comprising two bases, wherein each of the two bases is a base of one of said two NPN input transistors, said first inputs coupled to a radio frequency (RF) differential signal having an RF carrier frequency; and first LO inputs comprising two base pairs of said four cross coupled output transistors, said first LO inputs coupled to a first local oscillator (LO) differential signal having a first LO frequency; and a first cross coupled differential mixer, comprising; four cross coupled input/output transistors having two emitter pairs DC coupled in series to two collector pairs of said four cross coupled output transistors; second LO inputs comprising two input/output transistors, said second LO inputs coupled to a second local oscillator (LO) differential signal having a second LO frequency; and differential mixer outputs comprising two collector pairs of said four cross coupled input/output transistors; and wherein the stacked double balanced mixer generates, at the differential mixer outputs, a second IF differential output signal having a second IF frequency equal to a difference of the RF carrier frequency and the sum of the first LO frequency and the second LO frequency; and wherein the double balance mixer and the first cross coupled differential mixer are implemented on the same integrated circuit substrate.
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Specification