Oscillation circuit

The invention discloses an oscillation circuit which comprises a first resistor, first to ninth NMOS tubes and first to eighth PMOS tubes. The first resistor and the first NMOS tube forms a bias current generation circuit, and the magnitude of bias current is adjusted to adjust the magnitude of a charging current and further to adjust the frequency of an oscillator. 本发明公开了种振荡电路。种振荡电路包括第电阻、第NMOS管、第二NMOS管、第PMOS管、第二PMOS管、第三NMOS管、第三PMOS管、第四NMOS管、第四PMOS管、第五NMOS管、第五PMOS管、第六NMOS管、第六PMOS管、第七NMOS管、第七PMOS管、第八NMOS管、第八PMOS管和第九NMOS管。第电阻和第NMOS管构成偏置电流产生电路，通过调节偏置电流的大小来调节充电电流的大小达到调节振荡器的频率。