Apparatus and method for tuning frequency

Patent metadata

Field	Value
Publication number	US-2017201281-A1
Application number	US-201615214784-A
Country	US
Kind code	A1
Filing date	Jul 20, 2016
Priority date	Jan 7, 2016
Publication date	Jul 13, 2017
Grant date	—

Abstract

A frequency tuning apparatus includes: a frequency tuner configured to tune an oscillation frequency of an oscillator based on target information extracted from a mapping table in correspondence to a target frequency, and oscillation information collected from the oscillator; and a frequency compensator configured to compensate for a compensation error between the tuned oscillation frequency and the target frequency based on an offset table.

First claim

What is claimed is:

1 . A frequency tuning apparatus comprising:
a frequency tuner configured to tune an oscillation frequency of an oscillator based on target information extracted from a mapping table in correspondence to a target frequency, and oscillation information collected from the oscillator; and a frequency compensator configured to compensate for a compensation error between the tuned oscillation frequency and the target frequency based on an offset table.

2 . The frequency tuning apparatus of claim 1 , wherein the frequency compensator is further configured to compensate for a capacitance of the oscillator based on a compensation signal extracted from the offset table in correspondence to the target frequency.

3 . The frequency tuning apparatus of claim 1 , wherein:
the oscillator comprises a capacitor having a capacitance configured to be tuned; the frequency tuner is further configured to control a portion of the capacitor in response to a control signal for controlling the capacitor; and the frequency compensator is further configured to control a remaining portion of the capacitor in response to a compensation signal extracted from the offset table in correspondence to the target frequency.

4 . The frequency tuning apparatus of claim 1 , wherein the frequency compensator is further configured to compensate for a control signal for controlling a capacitor of the oscillator based on a compensation signal extracted from the offset table in correspondence to the target frequency.

5 . The frequency tuning apparatus of claim 1 , wherein:
the oscillator comprises a capacitor having a capacitance configured to be tuned based on a digital code of a control signal; and the frequency compensator is further configured to change the digital code of the control signal based on a compensation signal extracted from the offset table in correspondence to the target frequency.

6 . The frequency tuning apparatus of clam 1 , wherein, in the offset table, compensation signals for compensating for compensation errors occurring with respect to corresponding target frequencies are mapped to the corresponding target frequencies.

7 . The frequency tuning apparatus of claim 1 , wherein, in the mapping table, information about a number of oscillations of corresponding target frequencies during a mask time is mapped to the corresponding target frequencies.

8 . The frequency tuning apparatus of claim 1 , wherein the frequency tuner comprises:
a first tuning controller configured to coarsely tune the oscillation frequency of the oscillator based on a result of comparing the target information to the oscillation information; and a second tuning controller configured to finely tune the oscillation frequency of the oscillator based on a result of comparing the target information to the oscillation information.

9 . The frequency tuning apparatus of claim 1 , wherein the oscillator is configured to oscillate at an oscillation frequency in which the compensation error is compensated for.

10 . A super regenerative receiver comprising:
a super regenerative oscillator configured to oscillate in response to a received external signal; and a frequency tuning apparatus configured to
tune an oscillation frequency of the super regenerative oscillator based on oscillation information collected from the super regenerative oscillator, and target information extracted from a mapping table and corresponding to a target frequency, and
compensate for a compensation error between the tuned oscillation frequency and the target frequency based on an offset table.

11 . The super regenerative receiver of claim 10 , wherein the frequency tuning apparatus comprises:
a frequency tuner configured to tune the oscillation frequency of the super regenerative oscillator; and a frequency compensator configured to compensate for the compensation error between the tuned oscillation frequency and the target frequency.

12 . The super regenerative receiver of claim 11 , wherein the super regenerative receiver is configured to activate the frequency tuner before receiving a data packet, and to inactivate at least a portion of the frequency tuner during receiving the data packet.

13 . The super regenerative receiver of claim 10 , wherein, in the offset table, compensation signals for compensating for compensation errors occurring with respect to corresponding target frequencies are mapped to the corresponding target frequencies.

14 . The super regenerative receiver of claim 10 , further comprising:
an isolator configured to electrically isolate the super regenerative oscillator from an antenna for receiving the external signal, receive the external signal from the antenna, and transfer the external signal to the super regenerative oscillator; and an envelope detector configured to detect an envelope from an oscillation signal of the super regenerative oscillator.

15 . The super regenerative receiver of claim 10 , wherein the frequency tuning apparatus is further configured to compensate for a capacitance of the super regenerative oscillator based on a compensation signal extracted from the offset table in correspondence to the target frequency.

16 . The super regenerative receiver of claim 10 , wherein:
the super regenerative oscillator comprises a capacitor having a capacitance configured to be tuned; and the frequency tuning apparatus is further configured to
control a portion of the capacitor in response to a control signal, and
control a remaining portion of the capacitor in response to a compensation signal extracted from the offset table in correspondence to the target frequency.

17 . The super regenerative receiver of claim 10 , wherein the frequency tuning apparatus is further configured to compensate for a control signal based on a compensation signal extracted from the offset table in correspondence to the target frequency.

18 . The super regenerative receiver of claim 10 , wherein:
the super regenerative oscillator comprises a capacitor having a capacitance configured to be tuned based on a digital code of a control signal; and the frequency tuning apparatus is further configured to change the digital code of the control signal based on a compensation signal extracted from the offset table in correspondence to the target frequency.

19 . The super regenerative receiver of claim 10 , wherein the frequency tuning apparatus is further configured to:
determine, as the compensation error, a difference between an oscillation frequency of the super regenerative oscillator during a period of time in which bias current injected to the super regenerative oscillator is constant before receiving a data packet and an oscillation frequency of the super regenerative oscillator during a period of time in which current of a quench waveform is injected, with respect to the target frequency; and map a compensation signal for compensating for the compensation error to the target frequency and to store the mapped compensation signal in the offset table.

20 . The super regenerative receiver of claim 10 , wherein the super regenerative receiver is further configured to:
oscillate the super regenerative oscillator in response to a transmission signal of the target frequency, to determine, as a target capacitance, a capacitance that maximizes an output of an envelope detector with changing a capacitance of the super regenerative oscillator; map, to the target frequency, an offset capacitance that is a difference

Assignees

• Samsung Electronics Co Ltd

Inventors

• KIM Seongjoong
• Kang Joonseong
• Yun Seok Ju
• Hong Young Jun

Classifications

• H04B1/1027

  assessing signal quality or detecting noise/interference for the received signal · CPC title

• H04B1/16 Primary

  Circuits · CPC title

• H03L7/0991

  the oscillator being a digital oscillator, e.g. composed of a fixed oscillator followed by a variable frequency divider (H03L7/0995 takes precedence; fixed oscillators with means for selecting among various phases H03L7/0814) · CPC title

• H04B2001/1072

  by tuning the receiver frequency · CPC title

• H03J2200/40

  Conversion to a zero or near-zero intermediate frequency · CPC title