초록 ▼

A microwave synthesizer is disclosed that may generate low phase noise and high frequency resolution microwave signals The microwave synthesizer may include a coarse-tuning loop, the coarse-tuning loop may be adopted to generate a first signal with coarsely adjustable frequency. The coarse-tuning lo

A microwave synthesizer is disclosed that may generate low phase noise and high frequency resolution microwave signals The microwave synthesizer may include a coarse-tuning loop, the coarse-tuning loop may be adopted to generate a first signal with coarsely adjustable frequency. The coarse-tuning loop may have a first voltage controlled oscillator (VCO). An output loop, the output loop may be adopted to generate a second signal with finely adjustable frequency. The output loop may have a second VCO. A frequency mixer may be configured to couple the coarse-tuning loop and the output loop. A frequency mixer may be adopted to subtract the first and second signals. A reference frequency source may be coupled to the coarse-tuning loop and the output loop to provide reference signal for the microwave synthesizer.

대표청구항 ▼

1. A microwave synthesizer, comprising: a coarse-tuning loop, the coarse-tuning loop adopted to generate a first signal with coarsely adjustable frequency, wherein the coarse tuning loop having a first voltage controlled oscillator (VCO);an output loop adopted to generate a second signal with finely

1. A microwave synthesizer, comprising: a coarse-tuning loop, the coarse-tuning loop adopted to generate a first signal with coarsely adjustable frequency, wherein the coarse tuning loop having a first voltage controlled oscillator (VCO);an output loop adopted to generate a second signal with finely adjustable frequency, wherein the output loop including a second VCO, the second VCO having a first and a second terminal,a phase-frequency detector (PFD), the PFD having a first and a second terminal, the second terminal of the second VCO is coupled to second terminal of the PFD via a frequency mixer, the first terminal of the PFD is coupled to the first terminal of the second VCO, the frequency mixer configured to couple the coarse-tuning loop and the output loop, the frequency mixer adopted to subtract the first and second signals;a direct digital synthesizer, the direct digital synthesizer provides tunable reference frequency to the second VCO; anda reference frequency source coupled to the coarse-tuning loop and the output loop to provide reference signal for the microwave synthesizer.