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PDF HMC1044LP3E Data sheet ( Hoja de datos )
| Número de pieza | HMC1044LP3E | |
| Descripción | Programmable Harmonic Low Pass Filter | |
| Fabricantes | Analog Devices | |
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HMC1044LP3E
v01.0712
Programmable Harmonic Low Pass Filter
1 - 3 GHz 3 dB BANDWIDTH
Typical Applications
The HMC1044LP3E is ideal for wideband transceiver
harmonic filtering applications including:
• Filtering LO Harmonics to Reduce Modulator
Sideband Rejection & Demodulator Image Rejection
• Amplifier Harmonic Filtering
• RF Filtering
Features
Programmable Bandwidth: 1 to 3 GHz
Compatible with Narrowband & Wideband:
• PLLs with Integrated VCOs
• Modulators
• Demodulators
LO Harmonic Rejection: ~20 dB
Improves Modulator/Demodulator Sideband/Image
Rejection Performance: 20 dB Typical
Single-Ended or Differential Options
Footprint up to 90% Smaller than Current Discrete
Fixed Bandwidth Solutions
16 Lead 3x3 mm SMT Package
Functional Diagram
General Description
The HMC1044LP3E is a programmable bandwidth
LPF (Low Pass Filter) targeted at all applications that
use quadrature modulators and/or demodulators. The
HMC1044LP3E filters out LO harmonics and ensures
little or no LO contribution to modulator sideband
rejection or demodulator image rejection performance.
Although targeted at LO filtering applications, the
HMC1044LP3E can be used to filter all RF harmonics
such as the ones generated by amplifiers.
The HMC1044LP3E offers a choice of 16
programmable bands, optimized for high and low
cellular bands ranging from 1 to 3 GHz, making the
HMC1044LP3E a truly wideband part compatible with
wideband PLLs with Integrated VCOs and wideband
quadrature modulators and demodulators. It enables
wideband multi-standard, multi-carrier designs that
are field configurable on-the-fly for each individual
application.
The HMC1044LP3E is packaged in a compact
3x3 mm QFN leadless package.
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1 page  
HMC1044LP3E
v01.0712
Programmable Harmonic Low Pass Filter
1 - 3 GHz 3 dB BANDWIDTH
Figure 7. Single-Ended
Return Loss vs. V3[1]
0
Band 0, 3 V, 3.3 V & 3.5 V
-5
-10
Band 15, 3 V,3.3 V & 3.5 V
-15
Band 8, 3 V, 3.3 V & 3.5 V
-20
-25
Band 7, 3 V, 3.3 V & 3.5 V
-30
0
1000 2000 3000 4000 5000 6000 7000 8000 9000
FREQUENCY (MHz)
Figure 9. Single-Ended Filter Group Delay[1]
0.8
Band 0
0.7
Band 8
Band 7
0.6 Band 15
0.5
0.4
0.3
0
500 1000 1500 2000 2500 3000 3500 4000
FREQUENCY (MHz)
Figure 8. Single-Ended
Return Loss vs.Temperature[1]
0
Band 0
Band 7
-5
-10
-15
Band 15
Band 8
-20
-25
-30
0
25 C
85 C
-40 C
1000 2000 3000 4000 5000 6000 7000 8000 9000
FREQUENCY (MHz)
[1] Low frequency performance limited by external DC blocking capacitors at RF input and output.
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4
5 Page 
HMC1044LP3E
v01.0712
Programmable Harmonic Low Pass Filter
1 - 3 GHz 3 dB BANDWIDTH
HMC1044LP3E Application Information
The HMC1044LP3E is an ideal LO harmonic filter for wideband applications featuring quadrature modulators and/or
demodulators. The HMC1044LP3E’s 16 user programmable bands enable the user to optimally attenuate 2nd and/
or 3rd LO harmonics in order to maximize quadrature modulator/demodulator sideband/image rejection performance.
Typical diagrams with the HMC1044LP3E are shown in Figure 10 and Figure 11.
Figure 10. Typical HMC1044LP3E transmitter application
Figure 11. Typical HMC1044LP3E receiver application
Background, LO Harmonics and Modulator/Demodulator Sideband/Image Rejection
Most wideband quadrature modulators/demodulators in the market use some form of a filter to create the required
in-phase and quadrature LO components at the fundamental frequency of the LO (1xLO). Others, less common
modulators/demodulators accept LO input at 2xLO frequency and are not based upon filters. The 1xLO types are
particularly sensitive to LO 3rd harmonic levels, while the 2xLO types are more sensitive to 2nd harmonic levels.
Harmonics are normally present in all VCOs and especially in RFICs with integrated VCOs. High LO harmonic content
causes amplitude and phase mismatches, and ultimately performance degradation in modulator sideband rejection
and demodulator image rejection, as shown in Figure 12.
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| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet HMC1044LP3E.PDF ] | |
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