GaAs MMIC

CGY 94

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Siemens Aktiengesellschaft

pg. 1/9

17.10.95

HL EH PD 21

Preliminary Datasheet

* Power amplifier for GSM or AMPS application
* Fully integrated 2 stage amplifier
* Operating voltage range: 2.7 to 6 V
* 2 W output power at 3.6 V
* Overall power added efficiency 46 %
* Input matched to 50

, simple output match

ESD:

Electrostatic discharge sensitive device,
observe handling precautions!

Type

Marking

Ordering code

(taped)

Package 1)

CGY 94

Q68000-A9124

MW 12

Maximum ratings

Characteristics

Symbol

max. Value

Unit

Positive supply voltage

Negative supply voltage

)

-8

Supply current

Channel temperature

TCh

150

癈

Storage temperature

Tstg

-55...+150

癈

Pulse peak power dissipation

duty cycle 12.5%, ton=0.577ms

PPulse

Total power dissipation

(Ts

81 癈)

Ts: Temperature at soldering point

Ptot

Thermal Resistance

Channel-soldering point

RthChS

K/W

1) Plastic body identical to SOT 223,

dimensions see chapter Package Outlines

2) V

= -8V only in combination with V

= 0V; V

= -6V while V

GaAs MMIC

CGY 94

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Siemens Aktiengesellschaft

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17.10.95

HL EH PD 21

Functional block diagram:

Control circuit:

The drain current ID of the CGY 94 is

adjusted by the internal control circuit.

Therefore a negative voltage (-4V...-6V)

has to be supplied at VG. For transmit

operation VTR must be set to 0V. During

receive operation VTR should be dis-

connected (shut off mode).

Pin #

Configuration

Negative voltage at control circuit (-4V...-6V)

VTR

Control voltage for transmit mode (0V) or receive mode (open)

3,4,5,10

GND 2

RF and DC ground of the 2nd stage

6,9

GND 1

RF and DC ground of the 1st stage

VD1

Positive drain voltage of the 1st stage

RFin

RF input power

GND 3

Ground for internal output matching

VD2, RFout

Positive drain voltage of the 2nd stage, RF output power

DC characteristics

Characteristics

Symbol Conditions

min

typ

max

Unit

Drain current stage 1

IDSS1

VD=3V, VG=0V, VTR n.c.

0.6

0.9

1.3

stage 2

IDSS2

2.7

4.1

5.9

Drain current with
active current control

VD=3V, VG=-4V, VTR=0V

1.1

Transconductance

gfs1

VD=3V, ID=350mA

0.25

0.32

(stage 1 and 2)

gfs2

VD=3V, ID=700mA

1.1

1.3

Pinch off voltage

VD=3V, ID<500

�

(all stages)

-3.8

-2.8

-1.8

Pin (8)

Pout (12)

GND1 (6, 9)

GND2

VD1 (7)

VD2 (12)

VG (1)

GND3 (11)

Control

Circuit

VTR (2)

(3, 4, 5, 10)

GaAs MMIC

CGY 94

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Siemens Aktiengesellschaft

pg. 3/9

17.10.95

HL EH PD 21

Electrical characteristics

(TA = 25癈 , f=0.9 GHz, ZS=ZL=50 Ohm, VD=3.6V, VG=-4V, VTR pin connected to

ground, unless otherwise specified; pulsed with a duty cycle of 10%, ton=0.33ms)

Characteristics

Symbol

min

typ

max

Unit

Supply current

VD=3.0V; Pin=10dBm

IDD

1.18

Negative supply current

(normal operation)

Shut-off current

VTR n.c.

400

�

Negative supply current

(shut off mode, VTR pin n.c.)

�

Gain

Pin=-5dBm

27.0

29.0

Power gain

VD=3.6V; Pin=10dBm

22.8

23.6

Output Power

VD=3.0V; Pin=10dBm

31.5

32.3

dBm

Output Power

VD=3.6V; Pin=10dBm

32.8

33.6

dBm

Output Power

VD=5V; Pin=10dBm

34.5

35.5

dBm

Overall Power added Efficiency

VD=3.0V; Pin=10dBm

Overall Power added Efficiency

VD=3.6V; Pin=10dBm

Overall Power added Efficiency

VD=5V; Pin=10dBm

Harmonics

(Pin=10dBm, CW)

VD=3.6V; (Pout=33.1dBm)

-
-

-49
-45

-
-

dBc
dBc

Input VSWR

VD=3.6V;

1.5 : 1

2.0 : 1

GaAs MMIC

CGY 94

_______________________________________________________________________________________________________

Siemens Aktiengesellschaft

pg. 4/9

17.10.95

HL EH PD 21

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Pout and PAE vs. Pin

(VD=3.6V, VG=-4V, VTR=0V, f=900GHz, pulsed with a duty cycle of 10%, ton=0.33ms)

-5

Pin [dBm]

Pout [dBm]

PAE [%]

Pout [dBm]

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PAE [%]

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Pout and PAE vs. Pin

(VD=5V, VG=-4V, VTR=0V, f=900GHz, pulsed with a duty cycle of 10%, ton=0.33ms)

-5

Pin [dBm]

Pout [dBm]

PAE [%]

Pout [dBm]

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PAE [%]

GaAs MMIC

CGY 94

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pg. 5/9

17.10.95

HL EH PD 21

S-Parameter at VD=3.6V and Pin=9dBm

(VG=-4V, VTR=0V, pulsed with a duty cycle of 10%)

S-Parameter at VD=5V and Pin=9dBm

(VG=-4V, VTR=0V, pulsed with a duty cycle of 10%)

-30

-25

-20

-15

-10

-5

750

770

790

810

830

850

870

890

910

930

950

f [M Hz]

Mag [dB]

MAG(s11)

MAG(s21)

-30

-25

-20

-15

-10

-5

750

770

790

810

830

850

870

890

910

930

950

f [M Hz]

Mag [dB]

MAG(s11)

MAG(s21)

GaAs MMIC

CGY 94

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Siemens Aktiengesellschaft

pg. 6/9

17.10.95

HL EH PD 21

Performance of internal bias control circuit

(VTR=0V)

0,4

0,6

0,8

1,0

1,2

1,4

1,6

1,8

2,0

2,2

2,4

2,6

2,8

3,0

2,0

2,5

3,0

3,5

4,0

4,5

5,0

5,5

6,0

-Vg / V

ID / A

ID (VD=3.0V)

ID (VD=6.0V)

GaAs MMIC

CGY 94

_______________________________________________________________________________________________________

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pg. 8/9

17.10.95

HL EH PD 21

Test circuit board:

Note:

By changing the position of the
6.8 pF capacitor at pin # 12 it is
possible to tune the board for
max. Pout or max. PAE. To
achieve the maximum output
power place the capacitor close
to the CGY94. For a better PAE
increase the distance between
the capacitor and the CGY94
device (2-5mm).

Principal circuit:

Pin (8)

Pout (12)

GND1 (6, 9)

GND2

VD1 (7)

VD2 (12)

VG (1)

GND3 (11)

Control

Circuit

VTR (2)

(3, 4, 5, 10)

1nF

4.7uF

1nF

43nH

6.8pF

VTR

+VD

OUT

2) Coilcraft SMD Spring Inductor

distribution by Ginsbury Electronic GmbH, Am Moosfeld 85 D-81829 M黱chen, Tel. 089/45170-223

43nH

GaAs MMIC

CGY 94

_______________________________________________________________________________________________________

Siemens Aktiengesellschaft

pg. 9/9

17.10.95

HL EH PD 21

APPLICATION - HINTS

1. CW - capability of the CGY94

Proving the possibility of CW - operation there must be known the total power dissipation of the

device. This value can be found as a function of the temperature in the datasheet (page 7). The

CGY94 has a maximum total power dissipation of Ptot = 5 W.
As an example we take the operating point with a drain voltage VD = 3 V and a typical drain current
of ID=1.0 A. So the maximum DC - power can be calculated to:

= =

This value is smaller than 5 W and CW - operation is possible.

By decoupling RF power out of the CGY94 the power dissipation of the device can be further

reduced. Assuming a power added efficiency (PAE) of 40 % the total power dissipation Ptot can be
calculated using the following formula:

PAE

tot

(

)

(

)

1 0 40

1 8

2. Operation without using the internal current control

If you don' t want to use the internal current control, it is recommended to connect the negative

supply voltage at pin 1 (VTR) instead of pin 2 (VG). In that case VG is not connected.

3. Biasing and use considerations

Biasing should be timed in such a way, that the gate voltage (VG) is always applied before the drain
voltage (VD), and when returning to the standby mode, the drain voltage has to be removed before
the gate voltage.

协谢械泻褌褉芯薪薪褘泄 泻芯屑锌芯薪械薪褌: Q68000-A9124

协谢械泻褌褉芯薪薪褘泄泻芯屑锌芯薪械薪褌: Q68000-A9124