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HSMS-2822 数据手册 - AVAGO Technologies（安华高科）
制造商:
AVAGO Technologies（安华高科）
分类:
肖特基二极管
封装:
SOT-23
描述:
15 VBR 1 pF
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HSMS-2822数据手册
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8
RF in
D1
R1 V+
R2
D3
C1V–
R4
D4
C1 = C2 ≈ 100 pF
R1 = R2 = R3 = R4 = 4.7 KΩ
D1 & D2 & D3 & D4 = HSMS-282R
C2
D2
68 Ω
R3
Figure 19. Schematic of Suppressed Harmonic Detector.
HSMS-282R
4.7 KΩ
4.7 KΩ
100 pF
100 pF
68 Ω
V–
RF in
V+
Figure 20. Layout of Suppressed Harmonic Detector.
Note that the forgoing discussion refers to the output volt‑
age being extracted at point V+ with respect to ground. If
a dierential output is taken at V+ with respect to V‑, the
circuit acts as a voltage doubler.
Mixer applications
The HSMS‑282x family, with its wide variety of packaging,
can be used to make excellent mixers at frequencies up
to 6 GHz.
The HSMS‑2827 ring quad of matched diodes (in the SOT‑143
package) has been designed for double balanced mixers.
The smaller (SOT‑363) HSMS‑282R ring quad can similarly
be used, if the quad is closed with external connections as
shown in Figure 21.
HSMS-282R
IF out
RF in
LO in
Figure 21. Double Balanced Mixer.
Both of these networks require a crossover or a three di‑
mensional circuit. A planar mixer can be made using the
SOT‑143 crossover quad, HSMS‑2829, as shown in Figure
22. In this product, a special lead frame permits the cross‑
over to be placed inside the plastic package itself, elimi‑
nating the need for via holes (or other measures) in the RF
portion of the circuit itself.
HSMS-2829
IF out
RF in
LO in
Figure 22. Planar Double Balanced Mixer.
A review of Figure 21 may lead to the question as to why
the HSMS‑282R ring quad is open on the ends. Distor‑
tion in double balanced mixers can be reduced if LO drive
is increased, up to the point where the Schottky diodes
are driven into saturation. Above this point, increased LO
drive will not result in improvements in distortion. The use
of expensive high barrier diodes (such as those fabricated
on GaAs) can take advantage of higher LO drive power,
but a lower cost solution is to use a eight (or twelve) diode
ring quad. The open design of the HSMS‑282R permits this
to easily be done, as shown in Figure 23.
HSMS-282R
IF out
RF in
LO in
Figure 23. Low Distortion Double Balanced Mixer.
This same technique can be used in the single‑balanced
mixer. Figure 24 shows such a mixer, with two diodes in
each spot normally occupied by one. This mixer, with a
suciently high LO drive level, will display low distortion.
HSMS-282R
180°
hybrid
IF out
LO in
RF in
Low pass
filter
Figure 24. Low Distortion Balanced Mixer.
[4] Alan Rixon and Raymond W. Waugh, “A Suppressed Harmonic Power
Detector for Dual Band ‘Phones,” to be published.
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