KH103AI datasheet(5/7 Pages) EXAR

5 / 7 page

REV. 1A January 2004

KH103

DATA SHEET

with a 70kHz square wave large enough to produce a

transition from +5V to -5V at the KH103 output and

adjusting Rb until the output of U1 is at a minimum. Ra

should be about 9.5Rg for bad results; thus, Rb should be

adjusted around the value of 0.5Rg.

Figure 3: Non-Inverting Gain Composite Amplifier

to be Used with Figure 1 Circuit

Figure 4: Inverting Gain Composite Amplifier to be

Used with Figure 2 Circuit

Bias Control

In normal operation, the bias control pin (pin 16) is left

unconnected. However, if control over the bias of the

amplifier is desired, the bias control pin may be driven

with a TTL signal; a TTL high level will turn the amplifier

off.

Distortion and Noise

The graphs of intercept point versus frequency on the

page 3 make it easy to predict the distortion at any fre-

quency, given the output voltage of the KH103. First con-

vert the output voltage Vo to Vrms = (Vpp/2√2) and then to

P = (10log10 (20Vrms2)) to get the output power in dBm.

At the frequency of interest, its 2nd harmonic will be S2 =

(I2 - P) dB below the level of P. Its third harmonic will be

S3 = 2(I3 - P) dB below the level of P, as will the two-tone

third order intermodulation products. These approxima-

tions are useful for P < -1dB compression levels.

Approximate noise figure can determined for the KH103

using the Equivalent Input Noise graph on page 3. The

following equation can be used to determine noise figure

(F) in dB.

where vn is the rms noise voltage and in is the rms noise

current. Beyond the breakpoint of the curves (i.e. where

they are flat) broadband noise figure equals spot noise,

∆f should equal one (1) and v

n and in should be read

directly off the graph. Below the breakpoint, the noise

must be integrated and

∆f set to the appropriate band-

width.

KH103AI 数据表(PDF) 5 Page - Exar Corporation

KH103AI 数据表(HTML) 5 Page - Exar Corporation

Html Pages

1 2 3 4 5 6 7

数据表下载