Title:
ミキサ回路および方法
Document Type and Number:
Japanese Patent JP2009519643
Kind Code:
A
Abstract:
A receiver circuit (10) is disclosed comprising: a low-noise amplifier circuit (12); a mixer circuit (14); and a capacitive coupling circuit (16) comprising matched capacitive coupling circuits. In one aspect, the mixer circuit has a transconductance g m of 50 to 200, the capacitive coupling having a capacitance C of 0.5 to 10 pF to couple an output radio frequency, RF, signal of the low-noise amplifier circuit into inputs of the mixer circuit, wherein ÉC > g m . In another aspect, the capacitive coupling circuit (16) comprises matched capacitive coupling circuits having a capacitor sized for a voltage drop of about 25 mV at room temperature such that sensitivity of the mixer circuit to imbalances in transconductance gains g m is reduced. In a further aspect, it is disclosed a receiver circuit (10) comprising a single-ended low-noise amplifier circuit (12); a quadrature mixer circuit (14) having a first and a second input; and a capacitive coupling circuit (16) that splits the single-ended output signal from the low-noise amplifier circuit into a first signal applied to the first quadrature mixer input, and a second signal applied to the second quadrature mixer input.
Inventors:
Mattison, Sven
Nilsson, Magnus
Niedal, Andreas
Mattson, Thomas
Nilsson, Magnus
Niedal, Andreas
Mattson, Thomas
Application Number:
JP2008544919A
Publication Date:
May 14, 2009
Filing Date:
November 16, 2006
Export Citation:
Assignee:
Telefon Akti Bora Get Elm Ericson (Pubble)
International Classes:
H04B1/26; H03D7/14
Domestic Patent References:
| JPH02274106A | 1990-11-08 | |||
| JPH0794952A | 1995-04-07 | |||
| JP2001257538A | 2001-09-21 | |||
| JP2005072735A | 2005-03-17 |
Foreign References:
| US20050101281A1 | 2005-05-12 | |||
| US20030130006A1 | 2003-07-10 |
Attorney, Agent or Firm:
Yoshiyuki Inaba
Shinji Oga
Toshifumi Onuki
Shinji Oga
Toshifumi Onuki