Datasheet ADCA3990 (Analog Devices) - 7
| Manufacturer | Analog Devices |
| Description | CATV Power Doubler Hybrid |
| Pages / Page | 9 / 7 — Data Sheet. ADCA3990. THEORY OF OPERATION. 75Ω. BIAS. CONTROL |
| File Format / Size | PDF / 232 Kb |
| Document Language | English |
Data Sheet. ADCA3990. THEORY OF OPERATION. 75Ω. BIAS. CONTROL
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Data Sheet ADCA3990 THEORY OF OPERATION
The ADCA3990 is a 75 Ω input and output matched module The module has a control pin (IADJ) to set the dc current designed for CATV applications. The ADCA3990 uses cascode consumption from low bias to the ful bias of the device by field effect transistor (FET) feedback amplifiers in a Class A connecting a resistor from this pin to ground or by the use of a push pull configuration. The bottom half of the cascode stages positive voltage. are implemented in a single-die linear FET process that minimizes parasitics, thereby enabling higher gain. The top devices in the cascodes are implemented using a linear GaN
75Ω 75Ω
process able to swing very high RF voltages. The frequency of
BIAS CONTROL
operation is from 45 MHz to 1218 MHz. Internally, the ADCA3990 module uses a balun to convert the 009 input signal to a balanced signal that feeds the active stages. An 16573- output impedance transformer and balun combination converts Figure 9. Simplified Schematic the balanced GaN signals to an unbalanced 75 Ω output. The output transformer also feeds the dc to the active stages and cancels second-order distortion products coming from the active devices. Rev. 0 | Page 7 of 9 Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS GENERAL PERFORMANCE DISTORTION DATA (40 MHz TO 550 MHz) ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION APPLICATIONS INFORMATION OUTLINE DIMENSIONS ORDERING GUIDE
The ADCA3990 is a 75 Ω input and output matched module The module has a control pin (IADJ) to set the dc current designed for CATV applications. The ADCA3990 uses cascode consumption from low bias to the ful bias of the device by field effect transistor (FET) feedback amplifiers in a Class A connecting a resistor from this pin to ground or by the use of a push pull configuration. The bottom half of the cascode stages positive voltage. are implemented in a single-die linear FET process that minimizes parasitics, thereby enabling higher gain. The top devices in the cascodes are implemented using a linear GaN
75Ω 75Ω
process able to swing very high RF voltages. The frequency of
BIAS CONTROL
operation is from 45 MHz to 1218 MHz. Internally, the ADCA3990 module uses a balun to convert the 009 input signal to a balanced signal that feeds the active stages. An 16573- output impedance transformer and balun combination converts Figure 9. Simplified Schematic the balanced GaN signals to an unbalanced 75 Ω output. The output transformer also feeds the dc to the active stages and cancels second-order distortion products coming from the active devices. Rev. 0 | Page 7 of 9 Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS GENERAL PERFORMANCE DISTORTION DATA (40 MHz TO 550 MHz) ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION APPLICATIONS INFORMATION OUTLINE DIMENSIONS ORDERING GUIDE
