Wireless radio-frequency transmission apparatus

Patent metadata

Field	Value
Publication number	US-9991895-B2
Application number	US-201415321991-A
Country	US
Kind code	B2
Filing date	Jun 26, 2014
Priority date	Jun 26, 2014
Publication date	Jun 5, 2018
Grant date	Jun 5, 2018

Abstract

A wireless radio-frequency transmission apparatus includes a phase frequency detector, a charge pump, a loop filter and a twin voltage-controlled oscillator. The twin voltage-controlled oscillator includes a first oscillator and a second oscillator. When the twin voltage-controlled oscillator is in a reception mode, the first and the second oscillators are coupled to each other to form a quadrature voltage-controlled oscillator, and the quadrature voltage-controlled oscillator, the phase frequency detector, the charge pump and the loop filter constitute a phase-locked loop to generate quadrature carriers. When the twin voltage-controlled oscillator is in a transmission mode, the first oscillator, the phase frequency detector, the charge pump and the loop filter constitute a phase-locked loop, and the second oscillator performs frequency modulation on transmitted data. The present disclosure can maintain a carrier frequency to be stable during high data rate transmission, and have a relatively short locking time of frequency hopping.

First claim

We claim:

1. A wireless radio-frequency transceiver apparatus, comprising:
a phase frequency detector;
a charge pump;
a loop filter; and
a twin voltage-controlled oscillator,
wherein the twin voltage-controlled oscillator comprises a first voltage-controlled oscillator and a second voltage-controlled oscillator which are of the same structure,
wherein the twin voltage-controlled oscillator further comprises and a first coupling branch and a second coupling branch,
wherein the first voltage-controlled oscillator has an output end connected to input ends of the first coupling branch and the second coupling branch respectively, and the second voltage-controlled oscillator has an output end connected to the input ends of the first coupling branch and the second coupling branch respectively,
wherein after current is applied to the first coupling branch and the second coupling branch, the first voltage-controlled oscillator and the second voltage-controlled oscillator are coupled through the first coupling branch and the second coupling branch to form the quadrature voltage-controlled oscillator and the twin voltage-controlled oscillator is switched to a reception mode, in the reception mode the first voltage-controlled oscillator and the second voltage-controlled oscillator are coupled to each other to form a quadrature voltage-controlled oscillator, and the quadrature voltage-controlled oscillator, the phase frequency detector, the charge pump and the loop filter constitute a phase-locked loop to generate quadrature carriers for receiving information,
wherein after the current is cut off from the first coupling branch and the second coupling branch, the first voltage-controlled oscillator and the second voltage-controlled oscillator are decoupled and the twin voltage-controlled oscillator is switched to a transmission mode, in the transmission mode the first voltage-controlled oscillator, the phase frequency detector, the charge pump and the loop filter constitute a phase-locked loop, and the second voltage-controlled oscillator is used for performing frequency modulation on transmitted data.

2. The apparatus according to claim 1 , wherein oscillation frequencies of the first voltage-controlled oscillator and the second voltage-controlled oscillator are controlled by a first frequency control signal.

3. The apparatus according to claim 2 , wherein the phase frequency detector, the charge pump and the loop filter adjust the first frequency control signal according to a feedback value of an output frequency of the twin voltage-controlled oscillator.

4. The apparatus according to claim 2 , further comprising:
a frequency presetting module configured to preset a frequency of the twin voltage-controlled oscillator when frequency hopping occurs in the twin voltage-controlled oscillator.

5. The apparatus according to claim 4 , wherein the frequency presetting module changes the first frequency control signal according to a first frequency preset control word.

6. The apparatus according to claim 5 , wherein the oscillation frequencies of the first voltage-controlled oscillator and the second voltage-controlled oscillator are further controlled by a second frequency preset control word.

7. The apparatus according to claim 6 , wherein the first frequency preset control word and the second frequency preset control word are preset according to a target frequency to which the twin voltage-controlled oscillator is intended to hop.

8. The apparatus according to claim 7 , further comprising:
a digital processor configured to sample the output frequency of the twin voltage-controlled oscillator when the digital processor is powered-on, to acquire a corresponding relationship between the output frequency of the twin voltage-controlled oscillator and the first frequency preset control word, and to acquire a corresponding relationship between the output frequency of the twin voltage-controlled oscillator and the second frequency preset control word.

Assignees

• Inst Semiconductors Cas

Inventors

• Chen Jingjing
• Wu Nanjian
• Wang Haiyong
• Liu Weiyang
• Feng Peng

Classifications

• H03L7/099 Primary

  concerning mainly the controlled oscillator of the loop · CPC title

• H04B1/403

  using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency · CPC title

• H04L27/152

  using controlled oscillators, e.g. PLL arrangements · CPC title

• H04B1/04

  Circuits · CPC title

• H04L7/033

  using the transitions of the received signal to control the phase of the synchronising-signal-generating means, e.g. using a phase-locked loop · CPC title