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TDA8050A

QPSK transmitter

Philips Electronics 

Philips Semiconductors

QPSK transmitter

Product specification

TDA8050A

SYMBOL

PARAMETER

CONDITIONS

MIN. TYP. MAX. UNIT

Quadrature modulator

I and Q inputs

Vi(DC)

Vi(p-p)

input DC level

signal input level (balanced)

(peak-to-peak)

fi(max)

I and Q maximum input

frequency

Zi(dif)

B(1 dB)

differential input impedance

1 dB bandwidth amplifier

Modulator

fc

output centre frequency

∆A

amplitude imbalance

∆Φ

phase imbalance

LO(sup)

Zo(dif)

LO suppression

differential output impedance

Modulator VCO

FOSC(mod) oscillation frequency

Converter output

VO

output level

∆VO

output flatness

fc

Zo(dif)

IP3

H2

H3

SO

output centre frequency

differential output impedance

3rd order interception point at

I input

2nd order harmonic of

5 to 65 MHz signal

3rd order harmonic of

5 to 65 MHz signal

mixer spurious outputs of

5 to 65 MHz signal

indicative

indicative

indicative

−

0.5 × VCC −

V

−

400

500 mV

−

10

−

MHz

−

4.4

−

10

−

kΩ

−

MHz

see Fig.3

see Fig.3

−

−

−

−

−

−

−

−28

−

1.8

140 MHz

±1 dB

±2 deg

−

dBc

−

kΩ

−

−

280 MHz

f = 5 MHz; Vi = 100 mVdif at

I and Q inputs

37.5 40

f = 5 to 65 MHz; Vi = 100 mVdif −

−

at I and Q inputs

5

−

−

150

see Fig.4

−

−

f = 10 to 130 MHz;

−

−

Vi = 100 mVdif at I and Q inputs

f = 15 to 195 MHz;

−

−

Vi = 100 mVdif at I and Q inputs

f = 5 to 65 MHz; Vi = 100 mVdif −

−

at I and Q inputs

42.5 dBmV

2

dB

65 MHz

−

Ω

52 dBmV

−40 dBc

−40 dBc

−45 dBc

Converter VCO

fosc(min)

fosc(max)

minimum oscillation frequency

maximum oscillation frequency

−

−

205 −

145 MHz

−

MHz

1999 Nov 05

7

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