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US 9,432,236 B2Granted
System for generating a calibration signal, related transceiver and method
AssigneeSTMicroelectronics S.r.l.
InventorsRanieri Guerra, Giuseppe Palmisano
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Abstract
A calibration signal is generated from a modulating signal having a first frequency and a carrier signal having a second frequency. A single-sideband mixer modulates the modulating signal on the carrier signal. At least two frequency dividers by two connected in cascade receive the modulating signal modulated on the carrier signal and generate an output of the calibration signal.
Claims17
A system for generating a calibration signal, comprising:
- a first source circuit configured to generate a first modulating signal having a first frequency;
- an oscillator configured to generate a first carrier signal having a second frequency;
- and
- a first circuit comprising:
- a first single-sideband mixer configured to modulate said first modulating signal on said first carrier signal;
- and
- at least two frequency dividers by two connected in cascade, wherein said at least two frequency dividers by two connected in cascade receive said first modulating signal modulated on said first carrier signal and output a first intermediate calibration signal;
- a second source circuit configured to generate a second modulating signal having a third frequency that is twice said first frequency;
- a second circuit comprising:
- a second single-sideband mixer configured to modulate said second modulating signal on said first carrier signal;
- and
- at least two further frequency dividers by two connected in cascade, wherein said at least two further frequency dividers by two connected in cascade receive said second modulating signal modulated on said first carrier signal and output a second intermediate calibration signal;
- and
- a mixer configured for generating said calibration signal via modulation of the first intermediate calibration signal with the second intermediate calibration signal.
11 more elements
A transceiver, comprising:
- a system for generating a calibration signal;
- and
- a receiver circuit configured to receive a radio-frequency signal, wherein said receiver circuit is configured for receiving said calibration signal during a calibration step;
- wherein the system for generating comprises:
- a first source circuit configured to generate a first modulating signal having a first frequency;
- a second source circuit configured to generate a second modulating signal having a second frequency that is twice the first frequency;
- an oscillator configured to generate a first carrier signal having a third frequency;
- a first circuit comprising:
- a first single-sideband mixer configured to modulate said first modulating signal on said first carrier signal;
- and
- a first at least two frequency divider circuit configured to divide said first modulating signal modulated on said first carrier signal and output a first intermediate calibration signal;
- a second circuit comprising:
- a second single-sideband mixer configured to modulate said second modulating signal on said first carrier signal;
- and
- a second frequency divider circuit configured to divide said second modulating signal modulated on said first carrier signal and output a second intermediate calibration signal;
- and
- a mixer configured to generate said calibration signal by mixing together the first and second intermediate calibration signals.
14 more elements
A method for generating a calibration signal, comprising the steps of:
- generating a first modulating signal having a first frequency;
- generating a second modulating signal having a second frequency that is twice the first frequency;
- generating a first carrier signal having a third frequency;
- modulating via a first single-sideband mixer said first modulating signal on said first carrier signal;
- generating a first intermediate calibration signal via a frequency division by at least four of said first modulating signal modulated on said first carrier signal;
- modulating via a second single-sideband mixer said second modulating signal on said first carrier signal;
- generating a second intermediate calibration signal via a frequency division by at least four of said second modulating signal modulated on said first carrier signal;
- and
- mixing said first and second intermediate calibration signals together to generate said calibration signal.
6 more elements
A system for generating a calibration signal, comprising:
- a first source circuit configured to generate a first modulating signal having a first frequency;
- a second source circuit configured to generate a second modulating signal having a second frequency that is twice the first frequency;
- an oscillator configured to generate a carrier signal having a third frequency;
- and
- a first mixing circuit configured to mix the first modulating signal with the carrier signal and divide by four to generate a first intermediate calibration signal;
- a second mixing circuit configured to mix the second modulating signal with the carrier signal and divide by four to generate a second intermediate calibration signal;
- and
- a third mixing circuit configured to mix the first intermediate calibration signal with the second intermediate calibration signal to generate said calibration signal.
5 more elements
Dependencies are inferred from the claim text.