LTC1758-2 查看數據表（PDF） - Linear Technology

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LTC1758-2

RF Power Controllers with 250kHz Control Loop Bandwidth and 40dB Dynamic Range

Linear Technology 

LTC1758-1/LTC1758-2

APPLICATIO S I FOR ATIO

This model (Figure 7) is being supplied to LTC users as an

aid to circuit designs. While the model reflects close

similarity to corresponding devices in low frequency AC

performance terms, its use is not suggested as a replace-

ment for breadboarding. Simulation should be used as a

forerunner or a supplement to traditional lab testing.

Users should note very carefully the following factors

regarding this model: Model performance in general will

reflect typical baseline specs for a given device, and

certain aspects of performance may not be modeled fully.

While reasonable care has been taken in the preparation,

we cannot be responsible for correct application on any

and all computer systems. Model users are hereby notified

that these models are supplied “as is”, with no direct or

implied responsibility on the part of LTC for their operation

within a customer circuit or system. Further, Linear Tech-

nology Corporation reserves the right to change these

models without prior notice.

In all cases, the current data sheet information is your final

design guideline, and is the only performance guarantee.

For further technical information, refer to individual device

data sheets. Your feedback and suggestions on this model

is appreciated.

Linear Technology Corporation hereby grants the users of

this model a nonexclusive, nontransferable license to use

this model under the following conditions:

The user agrees that this model is licensed from Linear

Technology and agrees that the model may be used,

loaned, given away or included in other model libraries as

long as this notice and the model in its entirety and

unchanged is included. No right to make derivative works

or modifications to the model is granted hereby. All such

rights are reserved.

This model is provided as is. Linear Technology makes no

warranty, either expressed or implied about the suitability

or fitness of this model for any particular purpose. In no

event will Linear Technology be liable for special, collat-

eral, incidental or consequential damages in connection

with or arising out of the use of this model. It should be

remembered that models are a simplification of the actual

circuit.

PCTL

CONTROL

AMPLIFER

BW1 ≅ 250kHz RF POWER AMP

+

VPCA/B

G1

G2

–

IFB

LTC1758

RF

H1

H2

CONTROLLED

RF OUTPUT

POWER

RF DETECTOR

1758 F05

DIRECTIONAL

COUPLER

14dB to 20dB LOSS

Figure 5. Closed Loop Block Diagram

80

70

60

50

40

30

20

10

0

–10

–20

–30

–40

–50

–60

100

120

RLOAD = 2k

110

CLOAD = 33pF 100

PHASE

90

80

70

60

GAIN

50

40

30

20

10

0

–10

–20

1k 10k 100k 1M 10M

FREQUENCY (Hz)

1758 F06

Figure 6. SPICE Model Open Loop Gain and Phase

Characteristics from RF to VPCA, PCTL < 640mV

11

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