| 摘要 |
A dynamic biasing of a transmitter chip (10) is disclosed. The transmitter chip (10) comprises a variable gain amplifying stage (20), a biasing stage (30), a phase shifting stage (40), and a mixing stage (50). In response to a voltage control signal (VCS) and a voltage intermediate frequency signal (VIF), the variable gain amplifying stage (20) provides a current drive signal (IDS) and a DC current control signal (ICS). While an ampere level (X1) of the DC component of the current drive signal (IDS) and an ampere level (X2) of the DC current control signal (ICS) vary as a function of any variations in the voltage control signal (VCS) as well as any variation in the temperature, process performance, and supply power of the transmitter chip (10), a ratio of the ampere level (X1) of a DC component of the current drive signal (IDS) to the ampere level (X2) of the DC current control signal (ICS) is constant. The current drive signal (IDS) and the DC current control signal (ICS) establish the dynamic biasing block in a current mode of operation that maintains a constant gain of the mixing stage (50). |
