CV110-1 查看數據表（PDF） - WJ Communications => Triquint

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CV110-1

Cellular-band High Linearity Downconverter

WJ Communications => Triquint 

CV110-1

Cellular-band High Linearity Downconverter

The Communications Edge TM

Product Information

Device Architecture / Application Circuit Information

RF OUT 1

28 27 26 25 24 23 22

21 IF OUT

GND 2 RF Amp

IF Amp 20 GND

N/C 3

GND 4

IF THRU 5

IF Feedthru

Path

19 N/C

18 GND

LO Driver Amp

17 BIAS

GND 6

16 GND

RF/IF 7 RF/IF

LO

15 LO IN

8 9 10 11 12 13 14

Stage

RF Amplifier

RF Filter

MMIC Mixer

IF Amplifier

CV110-1

Typical Downconverter Performance Chain Analysis

Gain

(dB)

Output

P1dB

(dBm)

Output

IP3

(dBm)

NF

(dB)

Current

(mA)

Cumulative Performance

Gain

(dB)

Output

P1dB

(dBm)

Output

IP3

(dBm)

NF

(dB)

13.5 21

40.0 3.5 150 13.5 21.0

40.0 3.5

-1.5 ---

---

1.5

---

12.0 19.5

38.5 3.5

-9.0

8

23.0 9.8

60

3.0

6.1

22.1 4.5

19.0 22

39.1 2.5 150 22.0 20.3

37.0 5.0

Cumulative Performance

360 22.0 20.3

37.0 5.0

RF Amp Bias

RF Bandpass Filter

RF Amp Matching IF Amp Matching IF Amp Bias

Optional IF

Lowpass Filter

LO Amp Bias

Printed Circuit Board Material:

.014” FR-4, 4 layers, .062” total thickness

RF / IF Diplexer

LO Amp Bias

Optional LO

Lowpass Filter

CV110-1: The application circuit can be broken up into four main

functions as denoted in the colored dotted areas above: RF/IF

diplexing (purple), amplifier matching (green), filtering (red), and dc

biasing (blue). There are various placeholders for chip components in

the circuit schematic so that a common PCB can be used for all WJ

single-branch converters. Additional placeholders for other optional

functions such as filtering are also included.

RF / IF amplifier match: The RF amplifier requires a matching element

(L10) for optimal gain and input return loss performance. The IF amplifier

requires matching elements to optimize the performance of the amplifier to

the desired IF center frequency. Since IF bandwidths are typically on the

order of 5 to 10%, a simple two element matching network, in the form of

either a high-pass or low-pass filter structure, is sufficient to match the

MMIC IF amplifier over these narrow bandwidths. Proper component

values for other IF center frequencies can be provided by emailing to

applications.engineering@wj.com.

Diplexer: In a downconversion application, the incoming RF signal

impinges on the switching elements of the mixer; the interaction

with these switches produces a signal at the IF frequency. The two

signals (RF and IF) are directed to the appropriate ports by the

external diplexer. A four-element diplexer is used in the circuit

implementation (L8 and C2 are not used). Pin 5 contains the IF

signal and allows the signal to be transferred to pin 25 for the

convenience of PCB layouts.

IF lowpass filter (optional) and LO LPF: Filtering of unwanted RF and

LO signals are typically performed in the IF chain. IF filtering may be

realized using lumped elements; placeholders (L9, C21, C22) are provided

in the application circuit to allow for filtering to be implemented if desired.

The recommended LO filtering component values (L1, C19, C20) are

shown in the application circuit schematics. LO filtering reduces

degradation in mixer performance due to the unwanted harmonics of the

fundamental LO input signal.

RF bandpass filter: Bandpass filtering is recommended to achieve

the best noise figure performance with the downconverter. The

bandpass filter, implemented with a SAW filter on the application

circuit, allows for the suppression of noise from the image frequency.

It is permissible to not use a filter and use a 2 dB pad with R6, R7,

and R16 instead with slightly degraded noise figure performance.

DC biasing: DC bias must be provided for the RF, LO and IF

amplifiers in the converter. R1 sets the operating current for the last

stage of the LO amplifier and is chosen to optimize the mixer LO

drive level. Proper RF chokes and bypass capacitors are chosen for

proper amplifier biasing at the intended frequency of operation. The

“+5 V” dc bias should be supplied directly from a voltage regulator.

This document contains information on a new product.

Specifications and information are subject to change without notice

WJ Communications, Inc • Phone 1-800-WJ1-4401 • FAX: 408-577-6621 • e-mail: sales@wj.com • Web site: www.wj.com

July 2003

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