INTEGRATED CIRCUIT CAPABLE OF REPEATEDLY USING CURRENT

• US 20110241789A1
• Filed: 09/18/2010
• Published: 10/06/2011
• Est. Priority Date: 04/01/2010
• Status: Abandoned Application

• Current Assignee: National Tsing Hua University
• Original Assignee: National Tsing Hua University
• Inventors: Hsu, Shuo-Hung, Chang, Wei-Sung
• Application Number:
  US12/885,494
• Publication Number:
  US 20110241789A1
• Time in Patent Office: Days
• US Class Current: 331/117.FE
• CPC Class Codes: H03B 5/1212 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 cross coupled pair
• CPC Class Codes: H03B 5/1221 the amplifier comprising multiple amplification stages connected in cascade
• CPC Class Codes: H03B 5/1228 the amplifier comprising one or more field effect transistors
• CPC Class Codes: H03B 5/124 the means comprising a voltage dependent capacitance

Abstract

The invention relates to an integrated circuit capable of repeatedly using current, the integrated circuit comprises: a first differential input, a first cross couple pair, a second differential input, a second cross couple pair, and a voltage-controlled oscillator, wherein a divider consists of the first differential input, the first cross couple pair, the second differential input, and the second cross couple pair, moreover, through the connection of the first differential input, the first cross couple pair, the second differential input, and the second cross couple pair, the divider and the voltage-controlled oscillator may be drove by only one single current, so that the circuit area, the power consumption, and the phase noise of the integrated circuit are simultaneously reduced.

Claims

1. An integrated circuit capable of repeatedly using current, comprising:

a first differential input, being as an inverting amplifier and having a first input, a second input, a first output, and a second output;

a first cross couple pair, having a first couple input, a second couple input, and a first couple output, the first cross couple pair being as an negative impedance of the first differential input by way of respectively connecting the first couple input and the second couple input to the first output and the second output;

a second differential input, being as the inverting amplifier and having a third input, a fourth input, a third output, and a fourth output;

a second cross couple pair, having a third couple input, a fourth couple input, and a second couple output, the second cross couple pair being as the negative impedance of the second differential input by means of connecting the third couple input and the fourth couple input to the third output and the fourth output, respectively; and

a voltage-controlled oscillator, having a first oscillator input, a second oscillator input, a first oscillator output, and a second oscillator output, the first oscillator input and the second oscillator input respectively connecting to the first couple output and the second couple output for coupling the voltage-controlled oscillator to the first cross couple pair and the second cross couple pair, so as to execute voltage-controlled oscillation of the signal outputted from the first cross couple pair and the second cross couple pair;

wherein a divider consists of the first differential input, the first cross couple pair, the second differential input, and the second cross couple pair, moreover, through the connection of the first differential input, the first cross couple pair, the second differential, and the second cross couple pair, the divider and the voltage-controlled oscillator being driven by only one single current.

2. The integrated circuit capable of repeatedly using current of claim 1, wherein the first differential input further comprises:

a first transistor;

a first amplifying resistor, being as an amplifying resistor of the first transistor, one terminal of the first amplifying resistor coupling to a drain terminal of the first transistor and another terminal thereof coupling to a DC bias;

a second transistor, connecting to the first transistor in parallel; and

a second amplifying resistor, being as the amplifying resistor of the second transistor, one terminal of the second amplifying resistor coupling to the drain terminal of the second transistor and another terminal thereof coupling to the DC bias.

3. The integrated circuit capable of repeatedly using current of claim 2, wherein a gate terminal of the first transistor is the first input of the first differential input, the gate terminal of the second transistor being the second input of the first differential input, and both a source terminal of the first transistor and the source terminal of the second transistor coupling to the second couple output.

4. The integrated circuit capable of repeatedly using current of claim 1, wherein the first cross couple pair further comprises a third transistor and a fourth transistor, a gate terminal of the third transistor connecting to a drain terminal of the fourth transistor, and the gate terminal of the fourth transistor connecting to the drain terminal of the third transistor, moreover, the drain terminals of the third transistor and the fourth transistor coupling to each other.

5. The integrated circuit capable of repeatedly using current of claim 1, wherein the second differential input further comprises:

a fifth transistor;

a third amplifying resistor, being as an amplifying resistor of the fifth transistor, one terminal of the third amplifying resistor coupling to a drain terminal of the fifth transistor and another terminal thereof coupling to a DC bias;

a sixth transistor, connecting to the fifth transistor in parallel; and

a fourth amplifying resistor, being as the amplifying resistor of the sixth transistor, one terminal of the fourth amplifying resistor coupling to the drain terminal of the sixth transistor and another terminal thereof coupling to the DC bias.

6. The integrated circuit capable of repeatedly using current of claim 5, wherein a gate terminal of the fifth transistor is the third input of the second differential input, the gate terminal of the sixth transistor is the fourth input of the second differential input, and both a source terminal of the fifth transistor and the source terminal of the sixth transistor coupling to the first couple output.

7. The integrated circuit capable of repeatedly using current of claim 1, wherein the second cross couple pair further comprises a seventh transistor and an eighth transistor, a gate terminal of the seventh transistor connecting to a drain terminal of the eighth transistor, and the gate terminal of the eighth transistor connecting to the drain terminal of the seventh transistor, moreover, the drain terminals of the seventh transistor and the eighth transistor coupling to each other.

8. The integrated circuit capable of repeatedly using current of claim 1, wherein the voltage-controlled oscillator further comprises:

a ninth transistor;

a tenth transistor, coupling to a drain terminal of the ninth transistor by a gate terminal thereof, and the gate terminal of the ninth transistor coupling to the drain terminal of the tenth transistor, so as to make the ninth transistor and the tenth transistor forming the negative resistor;

a first tuning capacitor, one terminal of the first tuning capacitor coupling to the drain terminal of the ninth transistor, and another terminal thereof coupling to a tuning voltage;

a second tuning capacitor, one terminal of the second tuning capacitor coupling to the drain terminal of the tenth transistor, and another terminal thereof coupling to the tuning voltage; and

an inductor, one terminal of the inductor coupling to the drain terminal of the ninth transistor and another terminal thereof coupling to drain terminal of the tenth transistor, the inductor being able to form two LC oscillators with the first tuning capacitor and the second tuning capacitor.

9. The integrated circuit capable of repeatedly using current of claim 8, wherein the capacitances of the first capacitor and the second capacitor can be adjusted by modulating the tuning voltage, so as to modulate the oscillating frequency of the LC oscillators.

10. The integrated circuit capable of repeatedly using current of claim 1, wherein the first couple output and the second couple output respectively couple to the second input and the first input for forming a positive feedback.