參數(shù)資料
型號: AD9146-M5375-EBZ
廠商: Analog Devices Inc
文件頁數(shù): 37/56頁
文件大小: 0K
描述: BOARD EVAL FOR AD9146 DAC
設(shè)計(jì)資源: AD9146-M5375-EBZ Schematic
AD9146-M5375-EBZ Gerber Files
標(biāo)準(zhǔn)包裝: 1
系列: TxDAC+®
DAC 的數(shù)量: 2
位數(shù): 16
采樣率(每秒): 1G
數(shù)據(jù)接口: 串行
設(shè)置時(shí)間: 20ns
DAC 型: 電流
工作溫度: -40°C ~ 85°C
已供物品:
已用 IC / 零件: AD9146
AD9146
Data Sheet
Rev. A | Page 42 of 56
REDUCING LO LEAKAGE AND UNWANTED
SIDEBANDS
Analog quadrature modulators can introduce unwanted
signals at the LO frequency due to dc offset voltages in the
I and Q baseband inputs, as well as feedthrough paths from
the LO input to the output. The LO feedthrough can be nulled
by applying the correct dc offset voltages at the DAC output.
This can be done using the auxiliary DACs (Register 0x42,
Register 0x43, Register 0x46, and Register 0x47) or by using
the digital dc offset adjustments (Register 0x3C through
Register 0x3F).
The advantage of using the auxiliary DACs is that none of
the main DAC dynamic range is used to perform the dc offset
adjustment. The disadvantage is that the common-mode level
of the output signal changes as a function of the auxiliary DAC
current. The opposite is true when the digital offset adjustment
is used.
Good sideband suppression requires both gain and phase
matching of the I and Q signals. The I/Q phase adjust registers
(Register 0x38 through Register 0x3B) and the DAC FS adjust
registers (Register 0x40 and Register 0x44) can be used to calibrate
the I and Q transmit paths to optimize sideband suppression.
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