Back to results
US 11,742,839 B2Granted
Local oscillator divider with reduced applied current variation
AssigneeQUALCOMM Incorporated
InventorsChen Zhai, Yung-Chung Lo
Life of this patent
Estimating the term…
Abstract
Aspects of the disclosure relate to a local oscillator frequency divider for a receiver or transmitter. In this regard a frequency divider has a first frequency input coupled to a first oscillator frequency output, a second frequency input coupled to a complementary second oscillator frequency output, a first in-phase/quadrature (I/Q) divided frequency output, and a complementary second I/Q divided frequency output. The frequency divider further has a first alternating current (AC) coupling capacitor between the first frequency input and the first oscillator frequency output and a second AC coupling capacitor between the second frequency input and the second oscillator frequency output.
Claims15
An apparatus comprising:
- a frequency divider having a first frequency input coupled to a first oscillator frequency output, a second frequency input coupled to a complementary second oscillator frequency output, a first in-phase/quadrature (I/Q) divided frequency output, and a complementary second I/Q divided frequency output;
- a first alternating current (AC) coupling capacitor between the first frequency input and the first oscillator frequency output and a second AC coupling capacitor between the second frequency input and the second oscillator frequency output;
- a first bias voltage source coupled to the first frequency input between the first AC coupling capacitor and the first frequency input through a series resistance;
- and
- a second bias voltage source coupled to the second frequency input between the second AC coupling capacitor and the second frequency input through a series resistance, wherein a first bias voltage of the first bias voltage source and a second bias voltage of the second bias voltage source are independently regulatable.
2 more elements
An apparatus, comprising:
- a frequency divider having a first frequency input coupled to a first oscillator frequency output, a second frequency input coupled to a complementary second oscillator frequency output, a first in-phase/quadrature (I/Q) divided frequency output, and a complementary second I/Q divided frequency output;
- a first alternating current (AC) coupling capacitor between the first frequency input and the first oscillator frequency output and a second AC coupling capacitor between the second frequency input and the second oscillator frequency output;
- and
- a first transistor of a first type, wherein the first frequency input comprises a gate of the first transistor, the first transistor being coupled to a supply voltage at a first transistor source and the frequency divider at a first transistor drain.
1 more element
An apparatus, comprising:
- a frequency divider having a first frequency input coupled to a first oscillator frequency output, a second frequency input coupled to a complementary second oscillator frequency output, a first in-phase/quadrature (I/Q) divided frequency output, and a complementary second I/Q divided frequency output;
- a first alternating current (AC) coupling capacitor between the first frequency input and the first oscillator frequency output and a second AC coupling capacitor between the second frequency input and the second oscillator frequency output;
- a first input buffer between the first frequency input and the first oscillator frequency output;
- and
- a second input buffer between the second frequency input and the second oscillator frequency output, wherein the first AC coupling capacitor is between the first input buffer and the first frequency input and the second AC coupling capacitor is between the second input buffer and the second frequency input.
2 more elements
A method comprising:
- receiving a first local oscillator signal;
- coupling a first alternating current (AC) component of the first local oscillator signal to a first frequency input of a frequency divider through a first coupling capacitance;
- receiving a complementary second local oscillator signal;
- coupling a second AC component of the second local oscillator signal to a second frequency input of the frequency divider through a second coupling capacitance;
- dividing the first AC component to generate a first in-phase/quadrature (I/Q) divided frequency output;
- dividing the second AC component to generate a complementary second I/Q divided frequency output;
- biasing the first frequency input to a first bias voltage between the first coupling capacitance and the first frequency input;
- and
- biasing the second frequency input to a second independently regulated bias voltage between the second coupling capacitance and the second frequency input.
6 more elements
A method, comprising:
- receiving a first local oscillator signal;
- coupling a first alternating current (AC) component of the first local oscillator signal to a first frequency input of a frequency divider through a first coupling capacitance;
- receiving a complementary second local oscillator signal;
- coupling a second AC component of the second local oscillator signal to a second frequency input of the frequency divider through a second coupling capacitance;
- dividing the first AC component to generate a first in-phase/quadrature (I/Q) divided frequency output;
- dividing the second AC component to generate a complementary second I/Q divided frequency output;
- and
- buffering the first local oscillator signal with a first inverter and a first feedback resistor and buffering the second local oscillator signal with a second inverter and a second feedback resistor.
5 more elements
Dependencies are inferred from the claim text.