Outline for Filters
02/21/2021
Special Note:
Since Filters involve Reactive Components, it would be well to discuss that aspect early.
Applications
-
Power Supplies:
- Removing the AC Component
- Ripple Reduction
-
Audio Circuits:
- Base Control
- Treble Control
- Hiss Reduction
- "Cross-Over" Unit for Speakers
-
Receivers (RF):
- Tuning
- "IF Transformers"
- Detector Circuit (Demodulation)
- Noise Reduction
- Bandwidth
-
Transmitters:
- "MO" (or as in "LMO")
- Audio Limiting
- Sideband Control
-
Oscillators:
- Audio (Tone Generation)
- VFO (RF Tuning)
- BFO (RF Tuning)
- LMO (Linear Master Oscillator)
- Stabillity (Drift)
Considerations
-
Analysis:
- Spectral Analysis
-
Missile Telemetry
- (Frequency and Energy Subjected to Missile Payloads)
- General Types:
- Low-Pass
- High-Pass
- Bandpass
- Notch (Bandpass-Reject)
- Configuration:
- L-Type
- T-Type
- Pi-Type
- Unbalanced
- Balanced
- Uses:
(see "General Types", above)
- Signal Pass (Desired Signal)
- Signal Block (Undesired Signal)
- Terminology:
- Bandwidth
- "Q"
- Tuneable
- Stability (Drift)
- Signal Loss
- Quality Degredation
- Resonance
- Special RF
Consideratioons:
- Gamma-Match
- Hairpin Tuning
-
Shorted "Quarter-Wave" Stub
- Components:
-
Inductors:
- Solid-Iron-Core
- Powdered Iron-Core
- Air-Core
- "Q"
- "Skin-Effect"
- Transformer-Coupled
-
Capacitors
- Electrolytic
- Non-Electrolytic
- Resistance
- Vacuum (Tunable) Capacitors
-
Inductors:
- Special Types:
- "Twin-T"
- mDerived
- Constant-K
- Bessel
- Butterworth
- Crystal
- Mechanical (by Collins)
- Tracking Filter