发明名称 |
I/Q modulator and demodulator with wide instantaneous bandwidth and high local-oscillator-port-to-radio-frequency-port isolation |
摘要 |
An improved quadrature modulator/demodulator (IQMD) may use two-phase quadrature local oscillator (LO) signal generation for generating 0° and 90° LO signals, and an anti-phase combiner/divider (at 0° and 180°) on the RF (radio frequency) port. The IQMD may include mixers (which may be double-balanced passive mixers) that function as downconverters when a signal is incident at their radio frequency (RF) ports, and function as upconverters when signals are incident on their intermediate frequency (IF) ports. Accordingly, the IQMD may function as an I/Q modulator by connecting digital-to-analog converters (DAC) to the differential I and Q ports, and/or it may also function as an I/Q demodulator by connecting analog-to-digital converters (ADC) to the differential I and Q ports. |
申请公布号 |
US9621387(B1) |
申请公布日期 |
2017.04.11 |
申请号 |
US201514879285 |
申请日期 |
2015.10.09 |
申请人 |
NATIONAL INSTRUMENTS CORPORATION |
发明人 |
Magers Justin R. |
分类号 |
H04B1/38;H04L27/20;H04L27/227;H04B1/403;H04B1/48 |
主分类号 |
H04B1/38 |
代理机构 |
Meyertons Hood Kivlin Kowert & Goetzel, P.C. |
代理人 |
Meyertons Hood Kivlin Kowert & Goetzel, P.C. ;Hood Jeffrey C. |
主权项 |
1. A modulator/demodulator comprising:
an RF port; a first circuit comprising a first port coupled to the RF port, and further comprising a second port and a third port, wherein the first circuit is configured to:
generate a pair of out-of-phase input signals at the second port and third port, responsive to the first port being excited by a first signal received at the RF port; andgenerate a summed output signal at the first port, responsive to the second port and the third port being excited by a pair of out-of-phase output signals; a first mixer coupled to the second port, and configured to:
downconvert a first out-of-phase input signal of the pair of out-of-phase input signals to a first pair of incoming baseband signals; andupconvert a first pair of outgoing baseband signals to a first out-of-phase output signal of the pair of out-of-phase output signals; and a second mixer coupled to the third port, and configured to:
downconvert a second out-of-phase input signal of the pair of out-of-phase input signals to a second pair of incoming baseband signals; andupconvert a second pair of outgoing baseband signals to a second out-of-phase output signal of the pair of out-of-phase output signals. |
地址 |
Austin TX US |