The HMC647LP6GETR is a high-performance 6-bit digital phase shifter developed by Analog Devices Inc. (ADI), 

designed for precise phase control in RF and microwave systems. 

This surface-mount component operates within a frequency range of 2.5 to 3.1 GHz and provides full 360° phase coverage with a least significant bit (LSB) of 5.625° .

Key specifications:

• Frequency Range: 2.5 GHz to 3.1 GHz

• Phase Resolution: 6-bit (5.625° LSB)

• Phase Coverage: 360°

• RMS Phase Error: 1.5° (all states)

• Insertion Loss: 4 dB (typical)

• Insertion Loss Variation: ±0.4 dB

• Linearity: +50 dBm (typical)

• Control Logic: 0/+5V positive control

• Package: 6×6 mm 28-pin QFN leadless SMT package

• Impedance: Internally matched to 50Ω (no external components required)

Functional Characteristics

1. High Phase Precision: The device offers exceptional phase accuracy with only 1.5° RMS phase error across all phase states, 

2. enabling precise beamforming and signal manipulation .

3. Low Insertion Loss Variation: With ±0.4 dB insertion loss variation, 

4. the phase shifter maintains consistent signal amplitude across different phase settings, critical for maintaining system gain stability .

5. Excellent Linearity: The +50 dBm linearity ensures minimal distortion, 

6. making it suitable for high-performance RF systems where signal integrity is paramount .

7. Compact Integration: The 6×6 mm QFN package integrates all necessary matching components internally, 

8. simplifying board design and reducing footprint .

9. Simple Control Interface: 

10. The 0/+5V positive control logic simplifies integration with digital control systems and microcontrollers .

11. Broadband Performance: While optimized for 2.5-3.1 GHz operation, 

12. the phase shifter maintains good performance across this entire band without requiring band-specific tuning .

Primary Applications

1. Electronic Warfare (EW) Systems: Used in EW receivers for phase-based signal processing and direction finding applications .

2. Radar Systems: Essential for phased array radar systems, particularly in military and weather radar applications where precise beam steering is required .

3. Satellite Communications: Employed in SATCOM systems for beamforming and interference mitigation .

4. Beamforming Modules: Integral component in active electronically scanned array (AESA) systems for phase adjustment of individual antenna elements .

5. Phase Cancellation Circuits: Used in interference cancellation systems and adaptive filtering applications 

6. Test and Measurement Equipment: Valuable for phase calibration and signal conditioning in RF test systems .

Similar Models and Alternatives

1. HMC647LP6E (Analog Devices)

   • Nearly identical specifications to HMC647LP6GETR

   • Same 6-bit resolution and frequency range

   • Different packaging option (Tape & Reel vs. Cut Tape) 

2. HMC647ALP6E (Analog Devices)

   • Similar 6-bit digital phase shifter

   • Same 2.5-3.1 GHz frequency range

   • Identical 28-pin QFN package

   • Slightly different performance specifications 

3. HMC933LP6GE (Analog Devices)

   • 6-bit digital phase shifter

   • Broader frequency range: 2.3-3.3 GHz

   • Higher phase resolution options available

   • Similar QFN package 

4. PE44820 (Peregrine Semiconductor)

   • 7-bit digital phase shifter

   • Frequency range: 0.7-3.0 GHz

   • UltraCMOS technology

   • Different control interface [citation:N/A]

5. HMC642ALC5 (Analog Devices)

   • 5-bit digital phase shifter

   • Frequency range: 5.9-7.1 GHz

   • Higher frequency operation

   • Different package (5×5 mm) 

Comparative Analysis

When comparing the HMC647LP6GETR with similar phase shifters, several key differences emerge:

1. Phase Resolution: The HMC647LP6GETR offers 6-bit resolution (5.625° steps), 

2. while alternatives like the PE44820 provide higher 7-bit resolution (2.8125° steps) for finer phase control [citation:N/A].

3. Frequency Range: The 2.5-3.1 GHz range is somewhat narrow compared to some alternatives like the HMC933LP6GE (2.3-3.3 GHz) or HMC642ALC5 (5.9-7.1 GHz) .

4. Package Size: The 6×6 mm QFN package is relatively compact compared to some alternatives, though similar-sized options exist .

5. Integration: The HMC647LP6GETR's internal 50Ω matching simplifies design compared to some alternatives requiring external matching networks .

6. Control Interface: The simple 0/+5V control logic is easier to implement than some alternatives requiring negative control voltages .

Selection Considerations

When choosing between the HMC647LP6GETR and its alternatives, engineers should consider:

1. Frequency Requirements: For applications outside 2.5-3.1 GHz, alternative models with different frequency ranges must be selected .

2. Phase Resolution Needs: If finer than 5.625° phase steps are required, higher-bit-count alternatives should be considered [citation:N/A].

3. System Integration: The internally matched 50Ω impedance and simple control interface make the HMC647LP6GETR easier to implement in many systems .

4. Package Constraints: Board space limitations may dictate package selection between similarly performing devices .

5. Cost and Availability: While performance is similar among some alternatives, cost and supply chain considerations may influence final selection

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