Frequency synthesis device and method

Patent metadata

Field	Value
Publication number	US-9722619-B2
Application number	US-201414893848-A
Country	US
Kind code	B2
Filing date	May 26, 2014
Priority date	May 27, 2013
Publication date	Aug 1, 2017
Grant date	Aug 1, 2017

Abstract

A frequency synthesis device, including: a first generator configured to generate a periodical signal with a frequency f 1 ; a second generator, coupled to the first generator and generating from the signal with a frequency f 1 a signal S G corresponding to a train of oscillations with a frequency substantially equal to N·f 1 , with a duration lower than T 1 =1/f 1 and periodically repeated at the frequency f 1 ; a third generator generating, from the signal S G , m periodical signals S LO _ CH1 to S LO _ CHm with frequency spectra each include a main line with a frequency f LO _ CHi corresponding to an integer multiple of f 1 , with 1≦i≦m, the third generator operating as a band-pass filter applied to the signal S G and discarding from the frequency spectra of each of the periodical signals S LO _ CH1 to S LO _ CHm lines other than the main line with a frequency f LO _ CHi .

First claim

The invention claimed is:

1. A frequency synthesis device comprising:
a first generator configured to generate a periodical signal with a frequency f 1 ;
a second generator coupled to the first generator and configured to receive at an input the periodical signal with the frequency f 1 and to generate at least one signal S G corresponding to a train of oscillations with a frequency substantially equal to N·f 1 , with a duration lower than T 1 =1/f 1 and periodically repeated at the frequency f 1 , with N an integer number higher than 1;
a third generator configured to generate, from the signal S G , m periodical signals S LO _ CH1 to S LO _ CHm with frequency spectra that each include a main line with a frequency f LO _ CHi corresponding to an integer multiple of f 1 , with 1≦i≦m, i and m being integer numbers, the third generator operating as a band-pass filter applied to the signal S G and discarding from the frequency spectra of each of the periodical signals S LO _ CH1 to S LO _ CHm lines other than the main line.

2. The frequency synthesis device according to claim 1 , wherein the periodical signals S LO _ CH1 to S LO _ CHm are substantially sinusoidal signals each having a substantially constant envelope.

3. The frequency synthesis device according to claim 1 , wherein the second generator includes:
at least one voltage-controlled oscillator with a free oscillation range that includes the frequency N·f 1 , the value of N being a function of a value of a first control voltage for being applied at an input of the voltage-controlled oscillator, and
at least one switch connected to a power supply input of the oscillator and configured to be controlled by the periodical signal with the frequency f 1 such that it generates a non-null supply voltage to the oscillator only during part of each period T 1 , or at least one switch connected to an output of the oscillator and configured to be controlled by the periodical signal with the frequency f 1 such that it breaks an electrical connection between the output of the oscillator and an input of the third generator during part of each period T 1 .

4. The frequency synthesis device according to claim 1 , wherein the frequencies f LO _ CHi are equal to frequencies (N+i−1)·f 1 .

5. The frequency synthesis device according to claim 1 , wherein the second generator includes:
m voltage-controlled oscillators configured to generate m signals S G1 to S Gm each corresponding to a train of oscillations with a frequency substantially equal to N·f 1 , with a duration lower than T 1 =1/f 1 and periodically repeated at the frequency f 1 , with N 1 integer numbers higher than 1, free oscillation ranges of which include the frequencies N i ·f 1 , values of N i being a function of values of first control voltages for being applied at inputs of the voltage-controlled oscillators, and
one or more switches each connected to a power supply input of one of the oscillators and configured to be controlled by the periodical signal with the frequency f 1 such that it generates a non-null supply voltage of one of the oscillators only during part of each period T 1 and/or one or more switches each connected to an output of one of the oscillators and configured to be controlled by the periodical signal with the frequency f 1 such that it breaks an electrical connection between the output of one of the oscillators and an input of the third generator during part of each period T 1 , the switches being included in the second generator, and the third generator being configured to generate the m periodical signals S LO _ CH1 to S LO _ CHm from the signals S G1 to S Gm .

6. The frequency synthesis device according to claim 5 , wherein the frequencies f LO _ CHi are equal to the frequencies N i ·f 1 and/or wherein the frequencies N i ·f 1 are consecutive integer multiples of the frequency f 1 .

7. The frequency synthesis device according to claim 1 , wherein the third generator includes plural frequency recovering circuits each outputting one of the m periodical signals S LO _ CH1 to S LO _ CHm , each frequency recovering circuit including at least one injection-locked oscillator for receiving at an input the signal S G or one of signals S G1 to S Gm and being at least periodically locked at the frequency f LO _ CHi , a value of which is a function of a value of a second control voltage for being applied at an input of the injection-locked oscillator and/or each frequency recovering circuit including at least one band-pass filter with a center frequency substantially equal to f LO _ CHi .

8. The frequency synthesis device according to claim 7 , wherein each frequency recovering circuit includes at least first and second injection-locked oscillators, the first of which is configured to output one of the m periodical signals S LO _ CH1 to S LO _ CHm and the second of which is configured to output another periodical signal in phase quadrature with the first of the m periodical signals S LO _ CH1 to S LO _ CHm via a coupling made between both injection-locked oscillators or via a phase shifter element arranged between the second generator and the injection-locked oscillators.

9. The frequency synthesis device according to claim 1 , wherein a value of the frequency f 1 is higher than about 500 MHz, and/or values of the frequencies f LO _ CHi are higher than about 10 GHz, and/or oscillations of the signal S G or of signals S G1 to S Gm are sinusoidal.

10. The frequency synthesis device according to claim 1 , wherein the first generator includes at least one resonator device and a phase-locked loop configured to regulate a phase of the periodical signal with the frequency f 1 outputted by the voltage-controlled oscillator of the phase-locked loop to a phase of a periodical signal outputted by the resonator device.

11. The frequency synthesis device according to claim 1 , wherein the first generator includes a resonator device configured to generate the periodical signal with the frequency f 1 .

12. A device for transmitting and/or receiving signals, comprising at least one frequency synthesis device according to claim 1 , whose outputs on which are outputted the periodical signals S LO _ CH1 to S LO _ CHm are connected to inputs of mixers of the transmitting and/or receiving device configured to carry out a frequency translation of the signals to be transmitted and/or received.

13. A frequency synthesis method, comprising:
generating a periodical signal with a frequency f 1 ;
generating, from the periodical signal with the frequency f 1 , at least one signal S G corresponding to a train of oscillations with a frequency substantially equal to N·f 1 , with a duration lower than T 1 =1/f 1 and periodically repeated at the frequency f 1 , with N an integer number higher than 1;
generating, from the signal S G , m periodical signals S LO _ CH1 to S LO _ CHm with frequency spectra that each include a main line with a frequency f LO _ CHi corresponding to an integer multiple of f 1 , with 1≦i≦m, i and m being integer numbers, via implementing a band-pass filtering function applied to the signal S G and discarding from the frequency spectra of each of the periodical signals S LO _ CH1 to S LO _ CHm lines other than the main line.

14. A method for making a frequency synthesis device, comprising:
making a first generator configured to generate a periodical signal with a frequency f 1 ;
making a second generator, coupled to the first generator and configured to receive at an input the periodic

Assignees

• Commissariat Energie Atomique
• Commissariat a L'Energie Atomique at aux Energies Alternatives

Inventors

• Siligaris Alexandre
• Gonzalez Jimenez Jose-Luis

Classifications

• H04B1/7174

  Pulse generation (in general H04L25/03834) · CPC title

• H03L7/24

  using a reference signal directly applied to the generator · CPC title

• H03L7/16 Primary

  Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop · CPC title

• H03L7/18 Primary

  using a frequency divider or counter in the loop (H03L7/20, H03L7/22 take precedence) · CPC title