US 2008/0074199 A1Published application

Injection-locked frequency divider

AssigneeNational Taiwan University of Science and Technology

InventorsSheng-Lyang Jang, Yun-Hsueh Chuang, Ren-Hong Yen, Shao-Hwa Lee

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Abstract

An injection-locked frequency divider is provided. The injection-locked frequency divider includes a variable reactance unit, a signal injection unit, a first switch, a second switch, a first transformer, and a second transformer. The variable reactance unit, the first switch, the second switch, the first transformer, and the second transformer form a transformer-based LC-tank oscillator. The signal injection unit receives an injection signal. When the injection-locked frequency divider is in a locked state, the transformer-based LC-tank oscillator outputs a frequency division signal. Employing the feedback action of the first transformer and the second transformer, the present invention not only has a wide locking range but also promotes the realization of the low operating voltage.

Claims35

Dependent claims

An injection-locked frequency divider, suitable for performing a frequency division action on an injection signal to generate a frequency division signal, comprising:

a variable reactance unit, having a first connecting terminal and a second connecting terminal, for adjusting a reactance value of the injection-locked frequency divider and outputting the frequency division signal through the first connecting terminal and the second connecting terminal;
a signal injection unit, coupled to the first connecting terminal and the second connecting terminal, for receiving the injection signal;
a first switch, with a first terminal coupled to the first connecting terminal and a control terminal coupled to the second connecting terminal;
a second switch, with a first terminal coupled to the second connecting terminal and a control terminal coupled to the first connecting terminal;
a first transformer, having a primary-side coil and a secondary-side coil, the primary-side coil of the first transformer being coupled between the first connecting terminal and a ground terminal, and the secondary-side coil of the first transformer being coupled between the second terminal of the first switch and an operating voltage;
and
a second transformer, having a primary-side coil and a secondary-side coil, the primary-side coil of the second transformer being coupled between the second connecting terminal and the ground terminal, and the secondary-side coil of the second transformer being coupled between the second terminal of the second switch and the operating voltage.

4 more elements

An injection-locked frequency divider, suitable for performing a frequency division action on an injection signal to generate a frequency division signal, comprising:

a variable reactance unit, having a first connecting terminal and a second connecting terminal, for adjusting a reactance value of the injection-locked frequency divider and outputting the frequency division signal through the first connecting terminal and the second connecting terminal;
a signal injection unit, coupled to the first connecting terminal and the second connecting terminal, for receiving the injection signal;
a first switch, coupled between the first connecting terminal and an operating voltage;
a second switch, coupled between the second connecting terminal and the operating voltage;
a first transformer, having a primary-side coil and a secondary-side coil, the primary-side coil of the first transformer being coupled between the first connecting terminal and a ground terminal, and the secondary-side coil of the first transformer being coupled between the control terminal of the first switch and the second connecting terminal;
and
a second transformer, having a primary-side coil and a secondary-side coil, the primary-side coil of the second transformer being coupled between the second connecting terminal and the ground terminal, and the secondary-side coil of the second transformer being coupled between the control terminal of the second switch and the first connecting terminal.

4 more elements

An injection-locked frequency divider, suitable for performing a frequency division action on an injection signal to generate a frequency division signal, comprising:

a variable reactance unit, having a first connecting terminal and a second connecting terminal, for adjusting a reactance value of the injection-locked frequency divider and outputting the frequency division signal through the first connecting terminal and the second connecting terminal;
a signal injection unit, coupled to the first connecting terminal and the second connecting terminal, so as to receive the injection signal;
a first P-type transistor, with a drain coupled to the first connecting terminal, a gate coupled to the second connecting terminal, and a source coupled to an operating voltage;
a second P-type transistor, with a drain coupled to the second connecting terminal, a gate coupled to the first connecting terminal, and a source coupled to the operating voltage;
a first transformer, having a primary-side coil and a secondary-side coil, the primary-side coil of the first transformer being coupled between the first connecting terminal and a ground terminal, the secondary-side coil of the first transformer being coupled between a base of the first P-type transistor and the operating voltage;
and
a second transformer, having a primary-side coil and a secondary-side coil, the primary-side coil of the second transformer being coupled between the second connecting terminal and the ground terminal, the secondary-side coil of the second transformer being coupled between a base of the second P-type transistor and the operating voltage.

4 more elements

An injection-locked frequency divider, suitable for performing a frequency division action on an injection signal to generate a frequency division signal, comprising:

a first switch, with a first terminal for outputting the frequency division signal and a second terminal coupled to an operating voltage;
a second switch, with a first terminal for outputting the frequency division signal and a second terminal coupled to the operating voltage;
a first transformer, having a primary-side coil and a secondary-side coil, the primary-side coil of the first transformer being coupled between the first terminal of the first switch and a ground terminal, and the secondary-side coil of the first transformer being coupled between the control terminal of the first switch and the ground terminal;
a second transformer, having a primary-side coil and a secondary-side coil, the primary-side coil of the second transformer being coupled between the first terminal of the second switch and the ground terminal, and the secondary-side coil of the second transformer being coupled between the control terminal of the second switch and the ground terminal;
a variable reactance unit, having a first connecting terminal and a second connecting terminal, the first connecting terminal being coupled to the first transformer and the second connecting terminal being coupled to the second transformer, and being used to adjust a reactance value of the injection-locked frequency divider;
and
a signal injection unit, coupled to the first connecting terminal and the second connecting terminal, so as to receive the injection signal.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/561,417Filed 19 Nov 2006
Priority: TW 9513575127 Sep 2006
Published: 27 Mar 2008
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

H03L 7/099
Details of the phase-locked loop: concerning mainly the controlled oscillator of the loop
H03B 5/1215
The amplifier comprising a pair of transistors, wherein an output terminal of each being connected to an input terminal of the other, e.g. a…
H03B 5/1228
Active element in amplifier being semiconductor device: the amplifier comprising one or more field effect transistors
H03B 5/1243
The means comprising a voltage dependent capacitance: the means comprising voltage variable capacitance diodes