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LB-45

更新时间： 2024-01-19 20:11:25

品牌	Logo	应用领域
美国国家半导体 - NSC		转换器
页数	文件大小	规格书
2页	85K
描述
Frequency-to-Voltage Converter uses Sampleand- Hold to Improve Response and Ripple

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LB-45 数据手册

National Semiconductor

Linear Brief 45

April 1979

Frequency-to-Voltage

Converter uses Sample-

and-Hold to Improve

Response and Ripple

Most frequency-to-voltage (F-to-V) converters suffer from

the classical tradeoff of ripple versus speed of response.

For example, the basic F-to-V converter shown below has

13 mVp-p of ripple, and a rather slow 0.6 second settling

such as LF398 can sample the F-to-V’s output at the peak

of its ripple, and hold it until the next cycle. The LF398 has

fairly low output ripple (rms) but it does have some short

duration noise spikes and glitches which can be removed

easily with a simple output filter. The ripple at the output of

the active filter V6 is smaller than 1 mV peak, but the set-

tling time for a step change of input frequency is only 60 ms,

time, when C

is 1 mF. If you want less ripple than that,

FILTER

the response time will be even slower. If you want quicker

response, it is easy to decrease C

increase by the same factor.

, but the ripple will

FILTER

or ten times quicker than the ‘‘basic’’ FVC with C

1 mF.

FILTER

The improved circuit in Figure 2 makes an end-run around

these compromises. low-cost sample-and-hold circuit

c c

(1.9V) (1.1R C )

t t

OUT

# J

output

ripple

p-p

(1.9V) (1.1R C )

t t

FILTER

# J

TL/H/8494–1

FIGURE 1. Basic Frequency-to-Voltage Converter

TL/H/8494–2

FIGURE 2. Improved F-to-V Converter Using Sample-and-Hold

1995 National Semiconductor Corporation

TL/H/8494

RRD-B30M115/Printed in U. S. A.

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