Spectrum analyzer and method for correcting frequency errors
First Claim
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1. A spectrum analyzer, comprising:
- a reference oscillator for providing a reference signal at a reference frequency;
an error detection circuit connected to receive said reference signal and a timing control signal and operable to determine an error in said reference frequency using said timing control signal and produce an error correction signal for use in correcting said error;
a frequency conversion device connected to receive said error correction signal and said reference signal and is operable to produce an output frequency using said error correction signal to compensate for said error in said reference signal;
an additional frequency conversion device connected to receive a radio frequency (RF) signal and a local oscillation signal produced from said reference signal and operable to convert said RF signal to an intermediate frequency (IF) signal using said local oscillation signal;
an analog-to-digital converter connected to receive said IF signal and operable to convert said IF signal to a digital signal; and
a processor including said frequency conversion device and connected to receive said digital signal and said error correction signal;
wherein said processor is operable to process said digital signal using said error correction signal.
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Abstract
A spectrum analyzer corrects for internal frequency errors in a reference oscillator using a timing control signal. The reference oscillator provides a reference signal at a reference frequency. An error detection circuit determines an error in the reference frequency using the timing control signal and produces an error correction signal for use by a frequency conversion device in adjusting an output frequency thereof to compensate for the frequency error in the reference frequency.
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Citations
20 Claims
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1. A spectrum analyzer, comprising:
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a reference oscillator for providing a reference signal at a reference frequency; an error detection circuit connected to receive said reference signal and a timing control signal and operable to determine an error in said reference frequency using said timing control signal and produce an error correction signal for use in correcting said error; a frequency conversion device connected to receive said error correction signal and said reference signal and is operable to produce an output frequency using said error correction signal to compensate for said error in said reference signal; an additional frequency conversion device connected to receive a radio frequency (RF) signal and a local oscillation signal produced from said reference signal and operable to convert said RF signal to an intermediate frequency (IF) signal using said local oscillation signal; an analog-to-digital converter connected to receive said IF signal and operable to convert said IF signal to a digital signal; and a processor including said frequency conversion device and connected to receive said digital signal and said error correction signal; wherein said processor is operable to process said digital signal using said error correction signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 20)
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12. A method for correcting frequency errors in a spectrum analyzer, said method comprising:
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receiving a reference signal at a reference frequency; determining an error in said reference frequency using a timing control signal; producing an error correction signal for use in correction said error; producing an output frequency by a frequency conversion device that uses said error correction signal and said reference signal to compensate for said error in said reference signal; receiving a radio frequency (RF) signal; converting said RF signal to an intermediate frequency (IF) signal using a local oscillation signal produced from said reference signal; converting said IF signal to a digital signal; and processing said digital signal using said error correction signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification