Relationships Performance Parameters Affecting Parameter Affected

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Relationships Performance Parameters Affecting Parameter Affected

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Parameters Affect Each Other
Relationships Performance Parameters
Affecting Parameter Affected Parameter Frequency
Range Power Output Tuning Sensitivity Supply Current Pushing Pulling Power Output Flatness Harmonics Modulation Suppression Bandwidth Phase Noise
Frequency Range Power Output Tuning Sensitivity Supply Current Pushing Pulling Harmonics Suppression Temperature Frequency Tuning Voltage Power Supply
D.1. E.1. A.2. B.1. A.3. A.4. B.2. E.2. G.2.
C.1.
I.1.
J.2.
C.3.
J.3. J.4. J.7.
C.4. A.5. B.3. E.3. A.1. D.2. F.2. G.1. C.2. I.2. H.1. J.6. J.1. J.5.
This Table
order explanation "Affecting Parameter" affects "Affected Parameter": intersection table between Affecting Affected parameters example, intersection "Frequency Range" affects "Phase Noise" J.2."). figure appearing intersection "J.2." example indicates where explanation Effect appears text: letter indicates Article number indicates Sub-Article example, "J.2." refers Article "J", Sub-Article "2"). Empty cells indicate that effect Affecting Parameter Affected Parameter insignificant does exist all.
Parameters Affecting Frequency Range
following parameters affect Frequency Range.
A.1. TUNING VOLTAGE increase tuning voltage range widens frequency range. A.2. TUNING SENSITIVITY Lower sensitivity means narrower frequency range given range tuning voltage. A.3. PUSHING Increased pushing causes decreased effective frequency range. A.4. PULLING Increased pulling causes decreased effective frequency range. A.5. TEMPERATURE increase range ambient operating temperature causes decrease VCO's frequency range vice-versa.
Parameters Affecting Power Output.
following parameters affect Power Output:
B.1. SUPPLY CURRENT Increasing supply current typically increases power output. B.2. PULLING improve pulling, output power should reduced connecting attenuation circuit output. Improved pulling also achieved connecting buffer amplifier output port. However, this buffer amplifier requires higher supply current. B.3. TEMPERATURE. From ambient temp temp increase results output power decrease 0.5dB 1.0dB typically. From ambient temp temp decrease results output power increase 0.5dB 1.0dB typically.
(NOTE: Definitions terms appear Pages 40-41)
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Parameters Affecting VCO's Power Output Flatness
following parameters affect Power Output Flatness:
C.1. FREQUENCY BANDWIDTH frequency range increased, difficulty achieve flat output power increased. C.2. TUNING VOLTAGE tuning voltage range reduced narrowed, flatter output power achieved. C.3. TUNING SENSITIVITY more difficult achieve flat output power high tuning sensitivity than tuning sensitivity. C.4. HARMONICS Adding output filter suppress harmonics some cases degrade power output flatness.
Parameters Affecting Modulation Bandwidth
following parameters affect Modulation Bandwidth:
H.1. FREQUENCY Higher modulation bandwidth easily achieved higher frequency.
Parameters Affecting Harmonics Suppression
following parameters affect Harmonics Suppression:
I.1. FREQUENCY BANDWIDTH easier achieve good harmonics suppression when frequency range narrow. I.2. TEMPERATURE With ambient temperature increase, harmonic level gets lower. With ambient temperature decrease, harmonic level gets higher.
Parameters Affecting Tuning Sensitivity
following parameters affect Tuning Sensitivity:
D.1. FREQUENCY RANGE given tuning voltage range, increasing frequency range requires increase tuning sensitivity, vice-versa. D.2. TUNING VOLTAGE given frequency range, increasing tuning voltage range decreases tuning sensitivity, vice-versa.
Parameters Affecting Phase Noise
following parameters affect Phase Noise:
J.1. FREQUENCY carrier frequency increases, it's more difficult achieve good phase noise. J.2. FREQUENCY RANGE It's easy achieve good phase noise when frequency range narrow. J.3. TUNING SENSITIVITY Increasing tuning sensitivity degrades phase noise vice-versa. J.4. SUPPLY CURRENT typically easy achieve good phase noise higher offset frequencies 1kHz) designs with high supply current. J.5. TUNING VOLTAGE given frequency range typically easy achieve good phase noise designs with wide tuning voltage range. J.6. TEMPERATURE Phase noise varies typically range. J.7. PUSHING High pushing cause phase noise degradation increased sensitivity power supply noise.
Parameters Affecting Supply Current
following parameters affect Supply Current:
E.1. POWER OUTPUT Increasing power output requires higher supply current. E.2. PULLING Same B.2. E.3. TEMPERATURE From ambient temp temp increase typically results supply current increase approximately 10%. From ambient temp temp decrease typically results supply current decrease approximately 10%.
Parameters Affecting Pushing
following parameters affect Pushing:
F.1. FREQUENCY frequency increases, difficulty achieving good pushing increased.
F.2. POWER SUPPLY Good pushing easier achieve designs with high current.
Typical values narrow band VCOs shown table below:
Parameters Affecting Pulling
following parameters affect Pulling:
G.1. FREQUENCY frequency increases, difficulty achieving good pulling increased. B.2.
G.2. SUPPLY CURRENT difficult achieve good pulling when there limit supply current consumption, fact that (connecting buffer amplifier output port) improving pulling increases current consumption.
PHASE NOISE (-dBc/HZ) 115÷120 110÷115 102÷110 95÷102
FREQUENCY (GHz) <0.5 0.5÷1
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Relationships Performance Parameters Affecting Parameter Affected

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